Rates of collision-induced electronic relaxation of single rotational levels of SO2 (Ã 1A2): Quenching mechanism by collision complex formation

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Abstract
The electronic quenching cross sections (σQ,M) of SO2 excited to single rotational levels (SRL’s) of the ‘‘B’’ band (J′=9, K′=9) and the ‘‘E’’ band (J′=6, K′=6) were measured from the shortening of the fluorescence decay times by the addition of a variety of nonpolar and polar collision partners (M) at room temperature. σQ,M for the B band SRL varied from 32 Å2 for M=He to 863 Å2 for M=CH3NO2. A similar variation of σQ,M for the E band SRL was also observed. Eighteen observed values of σQ,M are compared to the values calculated from various theoretical models of electronic quenching including collision complex formation. Temperature dependence of the electronic quenching cross section for the collision complex is presented.