Abstract
Quenching of the Mg(3s3p 1P1) state by several simple gases has been studied using pulsed laser techniques. Absolute quenching cross sections were determined by pulsed laser excitation of Mg(1P1) and time-resolved measurements of 2852 Å fluorescence. Qualitative identification of major exit channels was accomplished using laser-induced fluorescence at short time delays. Except for the inert gases and the perfluoroalkanes, the cross sections were approximately gas kinetic and correlated well with the C6 long-range forces coefficient to the power 0.48±0.05. In contrast to the analogous Cd(5s5p 1P1) level, production of Mg(3PJ) by collision-induced intersystem crossing was negligible for all quenching molecules studied. Production of MgH was observed for H2, CH4, C3H6, C3H8, and n-C4H10, but not for C2H2 or C2H4.
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