S B Rai
Articles written in Pramana – Journal of Physics
Volume 13 Issue 2 August 1979 pp 149-157 Spectroscopy
The spectrum of the
Volume 14 Issue 5 May 1980 pp 379-388 Spectroscopy
Emission spectrum of DyO molecule has been photographed under high resolution in the wavelength region 5000 to 6300 A. The observed bands have been arranged into three different band systems. The rotational structure in the (0, 0) band of system I is partially resolved and analysed. Isotopic shifts have been calculated for various isotopic molecules and compared with observations. Electronic states involved in the transitions have been discussed.
Volume 15 Issue 5 November 1980 pp 413-422 Molecular Physics
The spectrum of the C2II-X2
Volume 16 Issue 2 February 1981 pp 147-150 Molecular Spectroscopy
The C-X system of diatomic mercury chloride has been re-investigated in emission. The previous vibrational assignments of this system by Horne and others have been confirmed by measurement of the chlorine isotopic shift and improved vibrational constants for the ‘C’ state determined.
Volume 17 Issue 3 September 1981 pp 249-255 Spectroscopy
The B-A system of CP molecule has been reinvestigated. The rotational structures in the (0, 0) and (1, 1) bands have been photographed in the second order of a 10.6 m grating with 25
Volume 36 Issue 6 June 1991 pp 647-656
Laser optogalvanic (LOG) and emission spectra of the N2 molecule have been recorded at different discharge voltages and gas pressures in the spectral region 5400–6150 Å. It is observed that in the optogalvanic spectrum bands belonging to several systems develop extensively. Under the present discharge conditions bands of the first positive system are predominant. The variation of the signals with pressure and voltage in the two cases is discussed.
Volume 39 Issue 4 October 1992 pp 359-365
Two photon laser optogalvanic spectrum of the
Volume 43 Issue 3 September 1994 pp 231-236
The vibrational overtone spectra of aryl and alkyl C-H stretch vibrations in benzaldehyde have been studied using conventional IR and thermal lensing technique at room temperature. The stretching vibrational frequency
Volume 45 Issue 3 September 1995 pp 271-278
Two photon absorption spectrum of
Volume 50 Issue 5 May 1998 pp 405-418 Research Articles
Fluorescence spectrum of Dy3+, Dy3+-Ho3+, Tb3+ and Tb3+-Er3+ doped in calibo glass have been studied using Ar+ and excimer lasers. Non-radiative energy transfer from trivalent dysprosium and terbium (donors) to holmium and erbium (acceptors) respectively has been observed on the basis of decrease in the life time of the levels and reduction in fluorescence intensity of Dy3+ and Tb3+ on increasing Ho and Er concentrations. The interaction mechanism of donor and acceptor ions is found to be dipole-dipole in both cases. Various parameters such as donor-acceptor distances, non-radiative energy transfer efficiency (
Volume 93 | Issue 5
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