The gas-phase Raman spectra of P4, P2, As4, and As2. The resonance fluorescence spectrum of 80Se2. Resonance fluorescence–Raman effects in the gas-phase spectra of sulphur and I2. The effect of pressure on the depolarization ratios for I2

Abstract

The gas-phase Raman spectra of P₄,As₄,P₂,and As₂ are recorded and compared with literature values on P₂ and As₂ derived from electronic spectroscopy. The resonance fluorescence spectrum of ⁸⁰Se₂ is recorded over a restricted wavenumber range by use of argon-ion laser excitation. Resonance fluorescence–Raman effects are studied for both gaseous I₂ and sulphur vapour. In the case of I₂ the effect of high pressures of argon (up to 27·5 atm.) on the depolarization ratio is studied. For sulphur the gas-phase Raman spectra of S₆ and S₈ are obtained, together with a polarized band at 232 cm.^–1 which is probably due to S₇.