SCIENTIFIC ABSTRACT AKISHIN, P. A. - AKISHIN, P. A.

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• Publication Date: December 31, 1967
• Content Type: SCIENCEAB

Eleotronographic Investigation of the Structure of the SOV/55-58-6-28/31
Molecule of the Vaporous Halides Basic Elements
compound. For these investigation the electronograph MW was
used. To evaporate the metal-halides a heating system was
employed based on the bombardment by electrons. The apparatus and
the methods used In this connection are accurately described in
Xeference 10. All electron diffraction pictures takent CsHal, RbH&l,
KaHal, WaHal, and LiHalt with the exception of the bromide and the
iodide of Li showed a sinu5oidal extinction in their intensity
distribution. The results which were obtained by means of the
theoretioal spreading curvea of the intensity with bi-atomio
molecules, have been compiled in a table together with other
comparative data from -publications (Refs 1 and 4X(Ref 1: see
above, Relf 4 investigation with miarowaves). The table diows the
variation in the difference between the intermolecular distance
,Me--X for the said metal-halides ot the-values Ref 4 and of the
present investigation; from 0.04 1,(Cat Rb~salts) to 0-15 1 (Liesalts).
This variatim has been ascribed to the association of the molecules
in the vapor. The effective iptensity of the electron scattering
would be composed of the soattering of the monomers and of the
associates (M62X2)- On thetasis of the-lheo~etical curves having
Card 214 a certain content of monomers and dimors (see also Fig'l), and of

Slectronographio Investigation of the Structure of the WV/55-58-6-28/31
Molecule of the Vaporous._Halides of Basic Elements
the known distances Me-Xzr in the monomers and dimera the real
distance r--eff can be determined, and thus also (Fig 2) the
degree of the dimerization. The differenee of'the results in the
three investigations compared, is explained by,the different -
dimerization degree of the vapors investigated, this difference
being due to the various sections of the evaporatii~g ~rocdss in
which the electron diffra6tion pictures were takene The geometrical
configuration of the Individual atoms in the dimers of the
examples Li and Li'lm~- and TAY, has been determined by way of
92 Z-z
the comparison of the theoretical spreading curves for various
distances r(X-X) with the experimental spreading ourvea.(see Figs 4,
5,6). It is only regrettable that this method does not permit the
safe determination of all three parameters of a dimer Me. 46, Ne-61.
and X-X. The values obtalned are the followingt r(Li-BO'c2.35 4. i
r(Br-Br)=3-85 1,-~:Br-U-Br=110+46, r(LTA--T)22.54 r(.1-1)24.30 AO
C-U-1!116 + 40; r(Li-F101.68- 1, r(F-r,)-z2.67 There are "
6'figures, I Table, and 12 references, 3 of which axe Soviet.
Card 3/4

Electronographio Investigation of the Structure-of the SOV/55-58-6-28/31
Molecule of the Vaporous Halides of Basic Elements
ISSOCUTICK: Kafedra, fizioheakoy khimii (Chair for Mysioal Chemistry)
SUBKMED-. July 1-9,, 1958 October 4, 1958
Card 414
'M

SOV/78-3-12-2/36
AUTHORS: Gorokhov, L. X., Khodeyev, Yu. S., Akishin, P. k.
TITLE: Mass Spectrometric Investigation of the Sublimation of Sodium
Chloride (Mass-spektrometricheskoye issledovaniye-sublimatsi'i
khlorida, natriya)
PERIODICAL: Zhurnal neorganicheakoy khimii, 1958, Vol 3 Nr 12,
pp 2597-2598 (USSR)
ABSTRACT: The sublimation of sodium chloride was investigated using the
mass spectrometric method. The NaCl+ and Na 2Cl+'ions were
found In the mass spectrum, and at temperatures in the region
of the melting point trace amounts of the Na 3 C124' ion were
detected. These last ions form by a secondary reaction mechanism.
In the temperature range 834-9030K, the average of the ratio
iNaCl+/JNa 2Ci+ V 2. Using.the relationship lg(i Na2Cl+ T)-I/T
the heat of sublimation of the dimer form of the sodium chloride
AR2 - 55.3~+1.0 kcal/9 mol was computed. The dissociation energy
Card 1/2 of the dimer form is 4E - 45-~+-1.8 kcal. The results obtained

SOY/78-3-12-2/36
Mass Spectrometric Investigation of the Sublimation of Sodium Chloride
for 6H and 6H agree with the data of the publications. The
1 2
values for 4H i and AR2 are 51.1 and 55-5 kcal/mol, respectively.
There are 10 referencest 3 of which are Soviete
SUBMITTED: December 3, 1957
Card 2/2

AUTHORS: Akishin, P. A., Rambidi, N. 0. SOV/78-3-12-3/36
TITLE: Electronographio Investigation of the Structure of the cesium
Halide Moleculas (Elektronograficheskoye issledovaniye stroyeni
ys. molekul galogenidov tseziya)
PERIODICAL: Zhurnal neorgauichaskoy khimii, 1958, Vol 3, Nr 12,
pp 2599-2602 (USSR)
ABSTRAM. The structure of the cesium halides in the vapor state was in-
vestigated using the eleotr.onographic method. The electrono-
grams.of..the cesium.halide.vapors show similar distribution
and intensity of electron dispersion. Theoretical plots of the
intensity of the electron dispersion were calculated for the
diatomic CsX molecule using the following simplified equations:
- sinsr 8 Ln- . s in .2
mol
s.r A 2
The calculation of the distance-between the two atoms in these
molecules of oesiumhali-de.was carried.out using the method of
approximation. These calculations yielded the following results
for the atomic separations in the cesium halide molecules:
CsF = 2.335�0.019 X, CsC1 = 2.906+0.13 1, GsBr - 3.081+0-008 1
Card 1/2 and CsJ = 3.307.t0-015 1. The resid-ts for the inter-ato7mic

SOV/78-3-12-3/36
Electronographio Investigation of the Structure of the Cesium Halide
Molecules
distanCeB in the CsX molecules (x F, Cl, Br, J) obtainpd with
the electronographic method.agree well with those obtained
using the micro-wave spectra. The results were reproduoible
with an accuracy of 0.010 1.
There are 3 tables and 9 references, 3 of which are Soviet.
SUBMITTED: December 3, 1957
Card 2/2

KI e:;,411 /t/ P.
lf~
AUTHORS: Akishin, P. A., Spiridonov, V. P., 76-1-8/32
Sobo-le-v-, G. A., Naumov, V. A.
TITLE: Studies of Molecular Structure by Elentron Diffraction.
VIII. Barium Halides (ElektronoCraficheskoye issledovaniye
stroyeniya molekul. VIII. GaloEenid,;~ buri;,-a).
PERIODICAL: Zhurnal Fizicheskoy Khimii, 1958, Vol. 712, Nr 1, PP. 58-61
(USSR)
ABSTRACT: For the first time the hitherto in literature lackine data
on the confiGuration and the Ceometric parameters of the
molecules of all vaporous halides of barium are obtained.
That is to say of barium fluoride, barium chloride and barium
iodide. The takint; of electrono,vrans was carried out by means
of an apparatus with an evaporator for hiGh temperatures
according to the method used by the authors of earlier works
(ref. 1 to 6). The evaluation of ele--tronw-raar. vas carried
out accordinC to tvo nothods: the radial distribution according
to the variant of Uolter-Bich and that of consecutive
approximationn. With tho ovaluation accordinC to the second
method the authors established that the distribution of the
intensity of stray electrons of the barium halide vapors,
Card 1/3 observed experimentally is -well represented by the theorctical

Studies of Molecular Structure by Electron Diffraction. 76-1-8/32
VIII. Barium Halides
intensity curves I(s) (which had been calculated on the
condition of a linear confiLuration of the barium helide
molecules). The asrnmetry of the rin.-Is on the electronograins
of barium halide vai)ors in less marked than with those of the
corresponding halides of calcium and strontium (ref- 5,6).
Because of the greater charCe value of the barium nucleus
compared with the charCes of calciuin- and .9trontium nuclei,
the valence an;-le in the molecules of barium halides
according to t~u method of consecutive aDproximation can be
determined only less exact than with the molecules of
halides of calciui,.i and strontium.- In the case of all
comnounds investicated a linear molecular structure was
staled and the values of the intermolecular distances were
found. The error in the determination of these distances
Ba- X is +1- 1t5 ~lu- The authors ,3tated that the interatomic
distance Ra-X in chloride-, bromide- i_tnd iodide i-.iolecules
changes approximatively according to the linear law in
dependence on the ordinal number of the halide, while the
Card 2/3 distance Ba-F deviates atronfl-ly I-rom this regularity.

Studies of Molecular Structure by Electron Diffraction. 7 6-1-81312
VIII. Barium Halides
There are 2 fiLures, 5 tables, and 7 references, 6 of which
are Slavic.
ASSOCIATION: Moscow State University imeni 14. V. Lomonosov
(Moskovskiy cosudarstvennyy universitet im. 14. V.
Lomonosova).
SUBMITTED: September 117, 1956
AVAILABLE: Library of ConCress
Card 7,
V3

AUTHORS: Akishin, P. A., Spiridonov, V. P., SOV/76-32-7-38/45
REodch r07' -A. V
TITLE: On the Electron Diffraction Investigations of the Molecular
Structure of the Halides of Bivalent Tin and Lead (K voprosu-
ob elektronograficheskom issledovanii stroyeniya molekul
galogenidov dvukhvalentnykh olova i svint-ja'
PERIODICAL: Zhurnal fizicheskoy khimii, 1958, Vol. 32, Wr 7,
pp, 1679 - 1681 (USSR) -
ABSTRACT: According to quantum chemical concepts a triangular configuration
may be assumed for the molecules SnX 2 and PbX , and a tetra-
hedric structure for the molecules Snx 4 and Fix 4' While, on
t)ie handl reliable experimental information on the structure
of the latter two is known to exist, the problem of the structure
of the former two has not yet been solved. Investigations
carried out by Lister and Sutton (Ref 4) which were checked
by the authors of this paper according to the equation by
Schomaker (Ref 6) using the data obtained by the former, proved
to be insufficient. For thij reason the experiments were re-
Card 1/3- peated, using a more perfect apparatus and method of determina-

On the Electron Diffraction Investigations of the sov/76-32-7-38/45
Molecular Structure of the Halides of Bivalent Tin and Lead
tion. According to the experimental results obtained the
following was found: The electron diffraction investigations
of the gaseous halides of SnX 2 and PbX2 make possible the
determination of the inter-atomic distance metal - halide,
however, not that of the molecule configuration. It must be
taken into account that molecules of the types MeX, Me 2X21
Me2X4 , and others are contained in the vapors. The problem
of the molecular composition of the vapor could be solved
by the use of mass spectrometric methods, and that concerning
the molecular configuration by radiospectroscopic methods.
There are 1 figure, I table, and 7 references, 2 of which are
Soviet.
ASSOCIATION: Moskovskiy gosudarstvennyy universitet im. M.V.Lomonosova
(Moscow State University imeni M.V.Lomonosov)
SUBMITTED: October 17, 1957
Card 2/3

On the Electron Diffraction Investigations of the SOV/76-32-7-38/45
Molecular Structure of the Halides of B:tvalent Tin and Lead
1. Lead halides--Molecular structure 2. Tin halides--Molecular structure
3. Electron diffraction analysis-Applications
Card 3/3

AUTHORS! Akishin, P. A., Spiridonov, V. P. SOV/76-32-7-39/45
TITLE: The Electron Diffraction Investigation of the Molecular
Structure of MgJ,(Elektronograficheskoye issledovaniye stroyeniya
molekuly MgJ 2)
PERIODICALi Zhurnal fizicheekay khimii, 1958, Vol. 32, Nr 7,
pp~ 1682 - 1683 (USSR)
ABSTRACT; After the three other halides of magnesium had been investigated
in the previous paper the authors in this paper gave the results
of the investigation of MgJ 2' The substance to be investigated
was obtained by the action of iodine vapors on powdery magnesium
metal in vacuum under heating. The new electronograph was used
and the authors worked according to the method already described,
the electronograms obtained being evaluated according to the
method of consetutive approximations and the radial distribution
in variants. The electronograms taken show up to 8 interference
rings of a cert'~_in intensity distributionp whic-h is given; the
maxima of intensity drop uniformly together with the angle of
scattering. The corresponding graphs as well as a table con-
Card 1/3 taining the single values obtained are given. The following

The Electron Diffraction Investigation of the Molecular SOV/76-32-7-39/45
Structure of MgJ2
geometrical parameters are given for the MgJ2 molecule in
correspoxla~~nce with the results of the investigation:
r(j- '-j) - 2952 -+ O'O.J.
ZJ Mg - J = 180 + 300
There are 2 figures, I Table, and 5 references, 5 of which are
Sov:let.
ASSOCIATION: Moskovskiy gosudarstvennyy universitL~t im. M.V.Lomonosova
(Moscow State University imeni M.V.Lomonosov)
SUBMITTED: November 27, 1957
Card 2/3

The Electron Diffraction Investigation of the Molecular SOV/76-32-7-39/45
Structure of mgj2
1. Magnesium iodide--Molecular structure 2. Magnesium iodide-Electron diffraction
analysis
Card 3/3

jOTHORS s E._A,,, Vilkov, L. V., Tatevskiy, V. M. 20-1-33/58
AkishipnL
_
LITLE: Electron Diffraction Study of the Chloroprene Molecule
(Elektr 'onografioheskoye issledovaniye stroyeniya, molekuly
khloroprena).
rERIODICALs Doklady AN SSSR 1958, Vol. 118, Nr 1, pp. 117-120 (USSR)
ABSTRACT:- The task of the present work is the determination of the
spacial configurabion.and the geometric parameter of the
chloroprene.molecule by means of the method of the diffraction
of quick.electrons with a vapour jet of the substance to be
investigated. The apparatus for tho taking of electronograms
was already described in a preliminary work (ref. 1). With
'
series
long waves of electrons of from 0,0520 to 0$0540 1 7
of electronograms were obtained. With these electrons 8 max-
ima-and 7 minima were measured by means of visual evaluation
of their intensity, From the experimental data obtained and
given in'a table the curve of radial distribution was con-
structed. The calculation made with a variation of the values
of the intensity of the extremes proved the reliability of
the curve of rp--Aial distribution. The attachment of the peaks
of the curve of radial distribution to interatom distances in
Card 1/3 the chloroprene molecule arranged by the authors is

Electron Diffraction Study of the Chloroprene Molecule. 20-1-33/58
mentioned herei Then the theoretic curves of intensity of
various models (the structure parameters of which are menti-
oned in a table) are calculated according to the method of
successive approximatio 'n, Pot with all models the theoretic
intensity curves coincide with the experimental curve of
scattered electrons, This non-coincidence exists e.g. for
the plain traneisomer, the plain zis-isomer as well as for the
rotated isomer with a rotation.of the vinyl-groups by c,)Oo
around the C 2 .1. C3 group' The best coin6idence is obtained
for the plain model of the chloroprene molecule with trans-
position of double compounds and ClC2C 3- and C2C C - angles
differing by 50 *, as well as for the non-plain Uel of the
molecule,with a rotation of the vinyl-groups around the only
C2';'C3'Lcompound by 320 (rotation from the trans-position) and
with equal ClC2C3 - and C2C3C angles. The main parameters of
the two latter models coincil-ed completely with the int 'eratom
distances obtained from the curve of radial distribution. The
two most probable structures resulting from the electrono-
graphic investigation of the structure of the chloroprene
molecule are given with their numeric parameters. The double
carbon compounds in the chloroprene molecule have a trans-
'ard 2/3 figuration or a similar configuration, which coincides with

Electron Diffraction Study of the Chloroprene Molecule. 20-1-33/58
the earlier obtained infrared- and ultraviolet spectra of
ohloroprene. There are 3 figures, 2 tables, and 11 references,
3 of which are Slavic.
ASSOCIATION: Moscow State University imeni M. V. Lomonosov (Moskovskiy
gosudaTstvennyy universitet imeni M. V. Lomonosova).
PRESENTED: January 3, 1957, by N. N..Semenov, Academician.
SUBMITTEDs December 29, 1956
AVAILABLEs Library of Congress
Card 3/3

20-118--
5~W/59
AUTHORS: Akishin, P. A. , Rambidi, N. G.
TITLE
s Electronodiffraction Study of Lithium Oxide
.
. (Blektronograficheskoye issledovaniye stroyeniya molekuly
okisi litiya)
PERIODICAL: Doklady Akademii Nauk SSSR, 1958, Vol. 118, Nr 5, PP-973-976
(USSR)
ABSTRACTt In the present work the geo-netric structure of the Li 2 0 mole-
cule is determined experimentally by means of the method of
diffraction of fast electrons on a vapor jet of the material
to be investigated. Experiments were carried out with the
electronodiffraction equipment of the Moscow State University
for the investigation of the structure of the molecules of
not volatile compounds. The vapor jet of the material to
be investigated was produced by means of a high temperature
vaporizer with heating of the ampule by,electron bombardment.
Lithium oxide was vaporized from
a molybdenum ampule at
0
temperatures of - 1300 to -1350 C. The electronographs of
Card 1/3 the vapors were recorded on photographic plates. The lithium

201-118_~_35/59
Blectronodiffraction Study of Lithium Oxide
oxide preparation (purity 99,62 %) used here was produced by
thermal decomposition of lithium nitrate in a silver cruoible.
7 series of eleotronographs each/with 2 - 3 recordings of
different wave lengths of the electrons (within the values
?,= 0,0443 and X a OP0468 R) were produced from the vapors
of lithium oxide. The eleatronographs of the vapors had 3
to 4 distinct interfer.nae rings each, in the case of which
intensity distribution of the scattered electrons in the
diffraction pattern differs only little from a damped har-
monic function. These electronographs were then elaborated
by means of the method of the radical distribution and the
method of successive approximatiors. Starting with the tri-
angulaF model of the lithium oxide moleuule with an angle
of 110 between Li - 0 - bindings the value r(Li - 0)-
1,82 + 0;02 X of the interatomic distance Li - 0 is found
~
y the 'method of successive approx.'T,4tions. ComInring the .
here found distance of 1,82 in tho molecule of the gaseous
phase with the distanoe 2,00 of the atoms in the crystal
lattice the characteristic difference of lo % given also
in the technical publications for certain compounds is found.
Finally the autho:bs compare the experimental value of the
Card 2/3 interatomic distance U - 0 with the evaluation of this.

Electronodiffraction Study of Lithium Oxide
20-11$-
.!~-35159
distance found by various methods. There are 2 figures, I
table, and 13 references, 5 of which are Soviet.
ASSOCIATION: Moskovekiy gosudarstvenny universitet im. M. V. Lomonose,T
(JAoscow State University imeni M. V. Lomonosov)
PRESENTED: August 2, 1957, by N. N. Semenov, Member, Academy of Sciences,
USSR
SUBMITTED: JuV 30, 1957
Card 3/3

AUTHORSs Akishin, F. A. Spiridonov, V. P. , Sobolev, G. A. 20 118.-6-24/43
TITLE: Electron Diffraction Investigation of the Structure of
Beryllium Halide Molecules (Blektronograficheakoye issledovan-
iye stroyeniya molekul galogenidov berilliya)
PERIODICALs Doklady Akademii Nauk SSSR, 1958, Vol. 118, Nr 6, pp. 1134-
-1137 (USSR) -
ABSTRACTs The present paper investigates the structure of the vaporous
beryllium halides - of fluoride, chloride, bromide,and iodide
for which no data exist in publications on the geometrical
parameters. The produedon:processes for the individual pre-
parat.lons are shortly enumerated. The apparatus and the
measu'ring methods for the i~tection of electronographs were
described already earlier.-(Ref.,l).'For all vaporous
beryllium halides investigp~tpO bere 8- 10 series of electrono-
graphs each were taken. These electronographs had the
following intensity distribution; the even (2., 4., 8., and
10.) maxima are intensive and the uneven (3-, 5- 0 7., and
9.),,have a lower intensity than the even maxima. The in-
tensity of the even and uneven maxima decreases gradually
Ca.-d 1/3 with increasing soattering angle. The minima lying before

Electron Diffraction Investigation of the Structure of 20-11a-6-24/43
-Beryllium Halide Molecules
agreeing results on the configuration (i.e. in favor of the
linear structure) and on the geometrical parameters of the
molecules of the vaporous beryllium halides. There are 2
figures, 5 tables, and 14 references, 8 of which are Soviet.
ASSOCIATION: Moskovskiy gosudaretvenriyy'universitet im. M. V. Lomonosova
(Moscow state University imeni M. V. Lomonosov)
PRESENTED: August 2, 1957, by N. N. Semenov, Member,. Academy'of Sc;kepces,
USSR
SUBMITTED: July 30, 1957
Card 3/~.

AKISHIN. P. A.; VILKOV, L. V.
K
"Electron Diffraction Study of Some Halogenated Organic Compounds
and Regularities in the Interatomic Distances Carbon - Halogen"
a report presented at Symposium of the International Union of
Cr-jstallography Leningrad, ZI-Z7 May 1959

't" %~ - V.
AKISHIN, P.A.: MOM, G.: SPIRIDONOV) P. NAUMV, A.
"Electron Diffraction by Gases at the High Temperatures"
A report presented at the SYMposium of the International Union Conference of
Crystallography Lenningrad 21-27 MAY 1959
SO: B 3,135,471 28 July 1959

5(2) - SOV/156-59-1-1/54
AUT11CIRS: Akishin, P. A., 11aumov, V. A.
TITLE: Electronographic Investi-Cation of the 1,11olecular Structure of
Lanthanum Halides (Elel-tronograficheshoye issledovaniye
stroyeniya molchul Cm-loGenidov lant--na)
PERIODICAL: Nauchnyye doklady vysahey shkoly. Khil-iya i khimnichcs'~aya
tehhnoloCiya, 1959, Nr 1, pp 5 - 7 (USS-71)
ABSTRACT; Five to seven series of electronojrams were plotted from each
lanthanum halide compound with and without the use of the
82 sector at 40, 60, and 80 kv. The evaluation was carried
out according to the methods of successive apilroximations and
radial distribution. All curves of the radial distribution
(see diagram) show tvro peaks. The first and hiZhor one is
interprPted as r(La-X), the second and flat one as r(X-X)(r=
interatomic distance, X = F, Cl, Br, J). A flat triancular
model of the compounds Lay 3 is form-ad by the curves of radial.
distribution. The results are in
,;ood aLreer-ent dth, the data
on yttri,= haloGan compounds. The interatomic ei3t--,ices La-X
Card 1/2 in the series of Cl, Br, and J compounds cha,+..,:-,-. accordinj,, to

Bleetz-onoaraphic Investi-ation of -the Molecular Structure SOV/ir6-~59-1-1/~4
of Lanthanum Halides
the atomic nunber of the halogen folloviin- a linear law
(see diagram). The distance La-F does not follow this law.
but shows a con.~-iderably reduced value. The results of tl~e
approximate computations for lanthanum fluoride, chloride,
biomide, and iodide are sum2ariFed in a table. A second tablo
shows the determined intoratomic distances of the compounds
mentioned.-There are 2 figures, 2 tables, and 5 referer-ces,
1 of which is Soviet.
ASSOCIATION: Kafedra fizicheskoy khimii Moskovekogo gosudarstvennogo uni-
versiteta im. M. V. Lomonosova ( Chair of rhy.,:.ical Chcmi~5try
of Moscow State. University imei'd It. V. Lomonoz-,ov)
SUBMITTED: April 25, 1958
Card 2/2

24(7) SOV156-59-2-1/46
P
AUTHORS: AklLhin._ A..11 upov) V. A., Tatayakiy, V. M.
TITLE: The Electronographical Investigation of the Structure of the
Molecules-of the Neodymium Halogen Compounds (Elektronografi-
cheskoye issledavaniye stroyeniya molekul galogenidov neodima)
PERIODICAL.: Nauchnyye doklady vysshey shkoly. Khimiya i khimicheskaya
tekhnologiya, 1959, Nr 2, pp 222-9-232 (USSR)
ABSTRACT: In a previous investigation it was found (Ref 1) that the
moleoulee of LaX, (X - halogen) have a plane configuration
with the lanthanum.atom in the center of an equilateral tri-
angle..Beoause of the similar structure of the outer electron
shells a similar configuration was to be expected in the case
of neodymium. The measurements carried out by means of an
electronograph of the Chemical Department of the NGU (MoskovskLy
gosudarstvennyy universitet - Moscow State University) confirm
this. The electronograms were read according to the method of
radial distribution and according to the method of successive
approximation. Figure 1 shows the curves of radial distribu-
tion. The two peaks of the curve are interpreted as r(Nd - X)
and r(X '. X). They were in agreement with the expected plane
Card 1/2 configuration. The RMS oscillation amplitudes were computed

SOY/156-59-2-1/48
The Electronographical Investigation of the Structure of the Molecliles of
the Neodymium Halogen Compounds
and the theoretical curves of the scattering intensity were
plotted (Fig 2) which are in good agreement with the experi-
mentally found curves. Table 2 shows the RMS oscillation
amplitudes for NdF NdCl.,, NdBr and NdJ and the geometrical
39 3 3
parameter. The experimentally found symmetrical configuration
of LaX 3 (Ref 1 ' YX3 (Ref 7) and now also NdX3 confirm the
quantum chemical assumptions (Ref 8). In the series chlorine
bromine - iodine, neodymium - halogen follow approximately
a linear law, whereas the distance neodymium - fluorine is
considerably reduced, as it is the case with a number of
fluorine compounds. There are 2 figures, 2 tables, and 10
referenoesp 5 of which are Soviet.
PRESEIMD BY: Kafedra fizicheskoy khimii Moskovskogo gosudarstvennogo uni-
versiteta im, M. V. Lomonosova (Chair of Physical Chemistry,
Moscow StAe University iieni 11. V. Lomonosov)
SUBMITTED. October 13, 1958
Card 2/2

AXISHIN, P.A.; GOROKHOV, L.N.; SIDDROV, L.N.
Mass-spectrometric study of the a3vaporation of sodium ebloride
and lithium fluoride with the aid of a double effusion chamber.
Vent.Mook.un.Ser.mat.,mekh.,astron.,fiz.,khim. no.6;194-204
159. (MIRA 13:10)
1. Kafedra, fizicheskoy Oimii Hoskovskogo universiteta.
(Evaporation) (Alkali metal halides)
(Mass spectrometry)

FANCHEITKOV. G.M.; RDLORIN, A.M.- AKISHIN P.A.
Mass spectrometric study of the thermionic emission of cesium
with various emitters. riz. tvar. tela 1 no.6:919-922 Je 159.
(KRA 12: 10)
I*Mookovskiy gosudaretvanW universitat im, MoVe Lomonosova.
(Thermoionic emission)

AUTHORS; Akishin, P.A. , Rambidi, N.G. a%V/LjQ.4j~ft',74%o'
.Z
TITLE: The Electronoiraphic Study of the Structures of Moleculies
of the Aluminium Halides (Elektronograficheskoye
Iseledovanlye stroyentya molekul galogenidov alyuminiya)
PERIODICAL: Kristallografiya, 1959, Vol 4, Nr 2, pp 186-193 (USSR)
ABSTRACT: Electron-deficient molecules such as the Al 2X6 aluminiutr,
halides are of current interest. The existence of
dimers has been confirmed by speztra of combination
scattering in melts, vapour pressure, X-ray structure
analysis, I.R. absorption, etc. Electronographic studies
were made at a vapour pressure of about 10 mm Hg at
40, 60 and 80 W. For each material 15-,;25 series of
exposures were made. Precautions were taken against
hydrolysis. After photometry, radial distribution curves
were calculated front.
max
D(r) SI(s)- zxp(- a's 2)~ sin 5r-d--
Cardl/4 0

SOV('~0-4-2-7/36
The Electronographic Study of the Stru,,%tures of olecules of the
Aluminium Halides
after Karle and Karla (Ref 14). The theore'Cical curves
for refinement of parameters were calculated on the Strela
machine from;
t2. sin sr
I(s) z J. z --xp __: ~1* a %
ij J* ( 2 sr
Numerical data on the scattering curves are given. The
results found were, fluoride -- plane AIF- tr�angle with
0
Al F 1.6.3 t o.oi A'O F F 2.82 0..02A
F Al F =-120 chloride bridgre model of Al2C1 6
with symmetry V h and0Al -- Cl = 2.04 * 0,02 (r 1,3
Al - C1 = 2.24 +~ 0.02 A (r 1,8 ), a = 122' :t 3
Card2/4 P - 87 ft 3 : brom-J,de - bridge model. A12 Br6 with symmetry

SOV/70-4-a-7/36
The Bleotronographic Study of t1le Structures of Molecules of the
Aluminium Halides
V and Ali. - Br = 2.22 +- 0.02 (r Al. -Br
h 0
2.38 -K- 0.02 X (r a = 118 3 82 ;t- 3
iodide - plane AU 3 triangle, Al 1 2.44 2: 0002
I - Al - I = 1200 (assumed). The dimer was also present
in the iodide vapour.
A1F_ has not been hitherto examined. The results for the
Al 2X6 molecules agree best with Hamilton's calcilations
of the structure of diborane by the self-consistent
moleculaE orbital method. He described the valency state
by an sp hydrid wave function giving a bond angle of
0
120 . The angle of Z900 is explained by supplementary
hybridisation of sL? -- and p--orb:Lta].B perpendicular to
the plane of the sp functton.(in accordance with the
work of Hamilton (Ref 21)). Acknowledgments are made
to K.N.Seaenenko-and B.M. Shchedrin.
CareV4

SONMz2i7/36
The Electronographic Study of the Structures o o e u es of the
Aluminium Halides
There are 4 figures, 3 tables and 21 references. 2 of
which are Soviet, 3 German, 2 Preach and 14 English.
,,AqSOCIATION: Moskovskiy gosudarstvennyy univeraltet imeni
M-V. Lomonosova. (Mos,:tow State University imeni
M.V. Lomonoscv)
SUBMITTED: July 15, 1958
Card 4/4

SOV~10-11-24Q.6
AUTHORS: Altishin. P.A.. Naumov, V.A. an Tatevsk y, V.M.
TITLE: An Electr nogra hie Investigation of the tructure 04
Molecules of the Halides of Gallium and Yttrium.
(Elektx-on)graficheakoye �ssledovaniye stroyeniya molekul
galogenidcv galliya i ittriya)
PERIODICAL: Kristallografiya, 1959, Vol 4, Nr 2, pp 194-200 (USSR)
ABSTRACT: Investigations were made, as in-the previous paper.
using the sector-photometric method and the new alectrono-
graph at the MGU. The results were analysed by
successive approximations and the method of radial
distributions. Theoretical and experimental distribution
curves are reproduced. Ga Cl and Ga,Br4 were dimeric
2 - 6 ~ U
with Ga-Ga distances of 3 28 0and 3 .41 , respectively,
and angles X 3*-Ga 2-'X4 of i12 + 3 and 1100 +-3 and
Ga 1_X 5-Ga2of 910 +-3 and 930+-.-3.. All other distances are
tabulated. The other compounds GaF 31 GaI 31 YF 3! YCI 31
YBr3 and YI3 were plane triangular molecules with Me-X
Cardl/2

SOV/70-4-2-8/36
An Electronographic Investigation of the Structure of Molecules
of the Halides of Gallium and Yttrium.
dlitances of 1.88. 2.44, 2.0, 2.47, 2.63, 2.8o +.o.o3 A,
respectively. These observations contradict son;~ by
Brode (Ref 3). Ga 2F6 molecules were present (as shonn
by mass spectrometry) to an extent of'(1% and Ga 216
molecules were present to about 80,0' in GaI at the m.p.
There are 5 figures, 3 tables and 13 refeLnces, 3 of
which are Soviet, 10 English.
ASSOCIATION: Moskovskiy gosudarstvenny-y universitet imeni
M.V. Lomonosova (Moscow State University imeni
M*V. Lomonosov)
SUBMITTED: July 15, 1958
Card 2/2

SOV/ 0-4-3-11/32
.AUTflORS: Akishin, P.A., Vilkov, L.V. and 3osolovskiy, V.Ya.
TITLE: Investigation of the Structures of Molecules of Perchloric
Acid and Perchloric Anhydride
PERIODICAL; Kristallografiya, 1959, Vol 4, Nr 3, pp 355-359 (USSR)
ABSTRACT; HC104-was.made by distilling HC'.04'2H20 in vacuo 'fit"
oleum. C 1207 was made by reacting LIC104 with P205 and
distilling at -540 and 2 mm Hg. Electronograms were
taken as descr-4bed earlier (A.V. Frost et al. - Ref 5)
and interpretod in two ways: a) by transformation to
radial density distributions and b) by trial and error
involving comparison of observed and calculated scattering
C'Ur"ves. Calculations were made on the Strela machine.
For HC104 28 electronograms were taken for
X =--0.052 - o.o62 OA . Intensity curves showed 10 peaks
and led to final molesular dimensions of: 0
(C1 = 0) 1.42 +~0.01 A; (C1 - 0) 1.64 + 0.02 A and
0
Cardl/3 (O-Cl-(Y) 100, � 2 . H-posItIons were not found. There

SOV/70-4-3-11/32
Investigation of the Structures of Molecules of Perchloric Acid and
Perchloric Anhydride
are three Cl =-O bonds and one Cl - 0 in the HC104
molecule whicii has the symmetry C 3v *
For Cl 207 a series of 32 electronograms showed 8 peaks.
The molecule 0 3C1-O1-ClO 3 was found to have the following
dimensions: (CI =-O) (in the CIO 3 groups) +.424 +--O.ol
(Cl - 0:) 1~Z25 +~-O-03