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Fluorescence; photon impact; molecules; photoionization; photodissociation; dissociative photoionization

The fluorescence spectra of CS₂ and SO₂ have been studied at three incident photon wavelengths of 121.6, 73.6–74.4 and 58.4 nm and relative production cross sections for different product states have been measured. The CS(A¹Π→X¹Σ⁺) system between 240 and 290nm has been obtained when CS₂ is photoexcited at 121.6nm whereas CS₂⁺(B²Σ_u⁺→X²Π_g) and CS₂⁺(A²Π_u→X²Π_g) systems have been produced between 276 and 295 and 437 and 555nm respectively when excited by both the incident photon wavelengths of 73.6–74.4 and 58.4nm. The fluorescence spectra of SO₂ obtained at 121.6 and 73.6–74.4nm include the vibrational bands of SO(A³Π→X³Σ⁻) and SO(B²Π⁻→X³Σ⁻) systems from 240 to 268 and 268 to 442nm respectively whereas the emission spectrum at 58.4nm, has contributions from the two SO systems and SO⁺(A²Π→X²Π) system. In all these emission spectra, the fluorescence bands of different systems have been analyzed and their relative production cross sections have been measured. The results obtained in the present investigations have been compared with a few recent reliable measurements reported in literature.

I A Prajapati¹ S M Ahmed¹ Vijay Kumar¹

1. Physical Research Laboratory, Navrangpura, Ahmedabad - 380 009, India

Published

February 1991

Manuscript received

23 July 1990

Manuscript revised

19 October 1990