Vol 4 No 4

Asian Journal of Physics Vol. 4, No 4 (1995) 211 -216

Normal Coordinate Analysis, of complexes of the type XReO₃
(with X = F, Cl, Br and CH₃)

R PIKL AND W KIEFER

Institut fur Physikalische Chemie der Universitat Wurzburg
Marcasstr. 9-11, D-97070 Wurzburg, Federal Republic of Germany

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A normal coordinate analysis of several XReO₃-complexes with X = F, Cl, Br and CH₃ is performed and discussed. A comparison of the methyl group as point mass with the halogens has been examined and discussed. The calculations have also been expanded to include the whole methyl group.

Refs :

1 Sundermeyer J, Angew Chem, 105 (1993) 1195.

2 Muller A, Krebs B & Holtje W, Spectrochim Acta, 23A (1967) 2753.

3 Miller F A & Carlson G L, Spectrochim Acta, 16 (1960) 1148.

4 Mink J, Keresztury G, Stirling A & Herrmann W A, Spectrochim Acta, 50A (1994) 2039.

5 Lotspeich J F & Javan A, J Chem Phys, 31 (1959) 633.

6 Rao P K & Rao P B, Z Physik Chem, 42 (1964) 166.

7 Herrmann W A, Kiprof P, Rypdal K, Tremmel J, Blom R, Alberto R, Behm J, Albach R W, Bock H, Solouki B, Mink I, Lichtenberger D & Gruhn N E, J Am

Chem Soc, 113 (1991) 6527.

8 Beanie I R, Crocombe R A & Ogden J S, J Chem Soc Dalt Trans, (1977) 1481.

9 Muller A, Schmidt K H, Ahlborn E & Lock C J L, Spectrochim Acta, 29A (1973) 1773.

10 Midler A, Krebs B & Holtje W, Spectrochim Acta, 23A (1967), 2753.

11 McIntosh D F & Peterson M R, QCPE 342, 1991.

12 Fleischhauer H C, Ph D Thesis, University of Dusseldorf, 1991.

13 Wilson E B, J Chem Phys, 9 (1941) 76.

Asian Journal of Physics Vol. 4, No 4 (1995) 217 -232

General Valence Force Field and Normal Coordinate
Analysis of 1,3,5-Trisubstituted Benzenes

T POLZER AND W KIEFER^*

Institut fur Physikalische Chemie der Universitat Wurzburg
Marcasstr. 9-11, D-97070 Wurzburg, Federal Republic of Germany.

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The vibrational spectra of mesitylene and a complete 'assignment of the observed normal modes are presented and discussed together with literature data. A general valence force field suitable for different 1,3,5-trisubstituted benzenes was investigated and normal coordinate calculations for C₆H₅R (R = Me, Cl, Br) were performed. Good agreement between observed and calculated frequencies has been achieved. The force field together with force constants and potential energy distribution is presented. The complete set of the representations of the normal modes based on the calculated displacement vectors of the atoms is given.

Refs

1 See for example, G. Varsanyi, Assignments for vibrational spectra of seven hundred benzene derivatives, Vols. 1/2, Akademiai Kiado and Adam Hilger, Budapest and London 1974.

2 Kakiuti Y & Shimanouchi T, J Chem Phys, 25 (1956) 1253

3 Schmid E W & Brandmiiller J, Z Elektrochem, 64 (1960) 940

4 Albrecht A C, J Mol Spectrosc, 5 (1960) 236

5 Brandmiiller J. Schmid E W, Schrotter H W & Nonnenmacher G, Spectrochim Acta, 17 (1961) 523

6 Overend J & Scherer J R, J. Chem Phys, 32 (1960) 1289

7 Scherer J R & Overand J, Spectrochim Acta, 17 (1961) 719

8 Polzer T, Posset U, Engert C, Deckert V & Kiefer W, in: Selective reactions of metal activated molecules, Werner H, Griesbeck A G, Adam W, Bringmann G & Kiefer W (eds.), Vieweg Verlag Braunschweig 1992, 225

9 Polzer T, Ellebracht A & Kiefer W, J Orgarwmet Chem, 438 (1992) 383.

10 Pfitzer K S & Scott D W, J Amer Chem Soc, 65 (1943) 803

11 Green J H S, Harrison D J & Kynaston W, Spectrochim Acta, 27A (1971) 793

12 La Lau C & Snyder R G, Spectrochim Acta, 27A (1971) 2073

13 Favrot J & Forel M T, Can J Spectrosc, 21 (1976) 144

14 Scherer J R, Evans J C, Metzler W W & Overend J, Spectrochim Acta, 18 (1962) 57

15 Scherer J R, Evans J C, Muelder W W & Overend J, Spectrochim Acta, 18 (1962) 1579

16 Pauling L & Brockway L 0, J Amer Chem Soc, 59 (1937) 1223

17 Brockway L O & Palmer K J, J Amer Chem Soc, 59 (1937) 2181

18 Kossiakoff A & Springall H D, J Amer Chem Soc, 63 (1941) 2223

19 Duinker J C & Mills I M, Spectrochim Acta, 24A (1968) 417

20 Oskabak A G, Goodman L, Thakur S N & Krogh-Jespersen K, J Chem Phys, 83 (1985) 6047

21 Wilson E B, Decius J C & Cross P, Molecular vibrations, Dover Publications Inc, New York 1980

22 McIntosh D F & Peterson M R, QCPE 342, 1991

23 Fleischhauer H C, Ph D Thesis, University of Diisseldorf, 1991

24 Polzer T & Kiefer W, J Organomet^.Chem , 472 (1994) 303

Asian Journal of Physics Vol 4. No 4, (1995) 233-263

REVIEW ARTICLE

Laser speckles - A bibliographic review : 1991, 1992

K. SINGH and ARVIND KUMAR
Photonics Group, Department of Physics, Indian Institute of Technology; Delhi
Hauz Khas, New Delhi - 110016.

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`Speckle' being a subject of continuing interest for scientists and engineers, has resulted in tremendous growth of literature in the past. It can be seen that the activity in the field of speckles has been continuing without any sign of slowing down. The speckle-based techniques become even more attractive to the engineers when their applications become feasible in real-time replacing the processing of photographic records and the subsequent optical transformation of the processed speckle photographs (specklegrams). The availability of various types of nonlinear photorefractive crystals and spatial light modulators for recording the speckles has opened a new way for real-time processing of optical information. The present bibliographic review covers the years 1991 and 1992. It is hoped that this review would serve to give the readers an overview of the advances in the area of speckles. The main areas/topics covered during the years 1991 and 1992 are given.

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Refs :

[1] K. Singh, Atti Fond. G. Ronchi 27 (1972) 197-203.
Laser Speckles; Statistics, Removal and Applications, Part I. A Bibliography.

[2] K. Singh, J. Opt. (India) 9 (1980) 86-95. .
Laser Speckles - A Bibliography: 1974, 1975.

[3] K. Singh, J. Opt. (India) 8(1979)51-69.
Laser Speckles - A Bibliography: 1976-1978.

[4] K. Singh, J. Opt. (India) 10(1981)17-23.
Laser Speckles - A Bibliography: 1979.

[5] K. Singh, J. Opt. (India) 10(1980)61-67.
Laser Speckles - A Bibliography: 1980.

[6] K. Singh and Arvind Kumar, Opt. Appl. 18(1988)359-379.

Laser Speckles - A Bibliography: 1981, 1982.

[7] K. Singh and Arvind Kumar, Opt. Appl. 19(1989)389-402.

Laser Speckles - A Bibliography: 1983, 1984.

[8] K. Singh, Arvind Kumar and S. Baskar, J. Pure Appl. Phys. 1(1989) 129-149.

Laser Speckles - A Bibliography: 1985, 1986

[9] K. Singh and Arvind Kumar.

Laser Speckles - A Bibliography: 1987, 1988(communicated).

[10] K. Singh and Arvind Kumar.

Laser Speckles - A Bibliography: 1989, 1990(communicated).

ASIAN JOURNAL OF PHYSICS