Articles written in Proceedings – Section A
Volume 10 Issue 3 September 1939 pp 156-166
Volume 11 Issue 1 January 1940 pp 28-31
Volume 12 Issue 5 November 1940 pp 453-461
Volume 13 Issue 1 January 1941 pp 64-67
Volume 14 Issue 5 November 1941 pp 529-534
Volume 16 Issue 1 July 1942 pp 45-49
Volume 19 Issue 2 February 1944 pp 108-110
Volume 19 Issue 2 February 1944 pp 111-116
Volume 21 Issue 1 January 1945 pp 24-30
Volume 21 Issue 3 March 1945 pp 126-129
Volume 48 Issue 6 December 1958 pp 344-354
Wilson’s group theoretical method has been employed in the investigation of force constants of two molecules B211H6 and B210D6 which possess the X2Y6 bridge structure. Symmetry co-ordinates which are orthonormalized and which satisfy the transformation properties have been constructed for the X2Y6 molecules possessing the bridge structure and belonging to the symmetry D2
Volume 51 Issue 3 March 1960 pp 146-150
The changes in frequency and the intensities of the various unconjugated and conjugated substances in different solvents have been investigated. It is found that there is an increase in C=O frequency in non-polar solvents. The intensity of the C=O line shows in general, considerable diminution in non-polar solvents. The C=C, C − Harom and C-C vibrations also behave in the same way.
Volume 51 Issue 3 March 1960 pp 151-154
The intensities of characteristic vibrations in carboxylic acids, esters and nitriles have been studied. In both carboxylic acids and esters the intensities of Raman lines due to C=O, C-H bending and C-Haliph stretching vibrations are found to increase from lower to higher members of the series while there is a decrease in intensity of C-C frequency. The intensity of the lines due to C≡N vibration is found to be decreasing from lower to higher members of the series. The intensity in aromatic conjugated nitrile is found to be abnormally great when compared to that in unconjugated aliphatic nitriles.
Volume 52 Issue 3 September 1960 pp 101-108
Volume 53 Issue 4 April 1961 pp 195-201
The Raman spectra of the
Volume 53 Issue 4 April 1961 pp 202-205
The effect of various solvents on the intensity of C≡N vibration of benzo and acetonitriles has been studied. It has been observed that the aliphatic and aromatic non-polar solvents have no effect on the aromatic and aliphatic nitriles respectively. In all other cases, a marked variation in intensity has been noticed. The intensity of C≡N vibration in Raman effect shows a diminution when the solvent is changed from carbon tetrachloride to chloroform while it shows a considerable increase in infra-red.
Volume 55 Issue 3 March 1962 pp 161-167
The anharmonicity factors of B2H6 and B2D6 have been calculated using Dennison’s method. Using the calculated harmonic wave numbers, the valence force constants have been obtained by the Wilson’s F-G matrix method.
Volume 56 Issue 5 November 1962 pp 247-248
A normal co-ordinate treatment has been carried out to calculate the force constants of BH3CO and BD3CO molecules, on the basis of a Urey-Bradley potential force field.
Volume 56 Issue 5 November 1962 pp 258-261
Urey-Bradley force constants of ketene and deuteroketene have been evaluated by the normal co-ordinate treatment. Using these force constants, the fundamental vibrational wave-numbers for ketene and its deuterium analogue have been calculated and compared with the observed bands.
Volume 57 Issue 3 March 1963 pp 181-185
The force constants of SF4 molecule have been evaluated using the Urey-Bradley force field and compared with those obtained by F-G matrix method. Using the Urey-Bradley constants, the fundamental vibrational frequencies are calculated and compared with the observed frequencies.
Volume 57 Issue 3 March 1963 pp 186-189
THe Urey-Bradley force field has been employed in the investigation of force constants for the allene molecule. Using the Urey-Bradley force constants, the vibrational wavenumbers have been calculated and compared with the observed bands reported for this molecule.
Volume 58 Issue 5 November 1963 pp 290-295
The theory of the determination of the mean amplitudes of vibration in molecules using the symmetry co-ordinates has been applied to the cases of arsenic halides belonging to the pyramidal XY3 type and a few silicon and stannic halides of the tetrahedral XY4 type. The mean square amplitudes and mean amplitudes of vibration have been evaluated at 298° K.
Volume 58 Issue 6 December 1963 pp 373-380
The harmonic wave numbers for HCOF and DCOF have been calculated using the observed fundamentals and the force constants have been evaluated on the basis of the general quadratic and Urey-Bradley force fields. The out-of-plane fundamental in HCOF, which has not been reported so far, is calculated. The thermodynamic properties of HCOF and DCOF have been calculated for fourteen temperatures ranging from 200° K. to 1500° K. for the ideal gaseous state at one atmosphere pressure and for a rigid rotor, harmonic oscillator approximation.
Volume 61 Issue 4 April 1965 pp 255-259
The theory of mean square amplitude of vibration using the symmetry co-ordinates has been applied to the pyramidal XYZ2 molecular model. The elements of the mean square amplitude matrices and the mean amplitude quantities at 300° K. for thionyl halides have been reported.
Volume 61 Issue 4 April 1965 pp 260-265
The theory of mean-square amplitude matrices is applied to the bent XYZ molecules. The principal mean amplitudes of vibration for the molecules investigated here are reported for 300° K.
Volume 61 Issue 5 May 1965 pp 272-282
Applying Cyvin’s secular equation method the mean-square amplitude quantities are calculated for molecules of the linear and planar AXYZ type belonging to the symmetry Cs. The mean amplitude values for HN3, DN3, HNCS, HNCO, HCOF and DCOF molecules are evaluated at 300° K.
Volume 62 Issue 3 September 1965 pp 159-168
A normal co-ordinate analysis of ethylene oxide, ethylene oxide-d4 and ethylene sulphide is carried out and the potential energy constants are determined using both the most general quadratic potential function and Urey-Bradley force field. Using the potential energy constants obtained by the former method the mean amplitudes of vibration of these molecules are calculated by the secular equation method. The thermodynamic properties of these molecules are reported for the ideal gaseous state at one atmosphere pressure for eleven temperatures from 100° K. to 1000° K.
Volume 67 Issue 2 February 1968 pp 71-77
A theoretical treatment of the generalised mean-square amplitudes of vibration of some silicon compounds of XY3Z type molecules is presented. The numerical values evaluated for the parallel and perpendicular mean-square amplitudes for all the bonded and non-bonded atom pairs are tabulated. The L matrix elements and Coriolis coefficients have also been evaluated for these molecules.
Volume 70 Issue 3 September 1969 pp 126-139
General Valence force constants have been evaluated for GeH3CCH and GeD3CCH. Generalised mean-square amplitudes of vibration have been obtained and the shrinkage constants have been calculated using the perpendicular mean-square amplitudes of vibration. Coriolis coupling constants have also been determined.