Abstract
Rate coefficients for state-to-field vibrational relaxation of I2 (B 3Π0u+, υ′=16) induced by collisions with He at translational temperatures of 2–12 K are measured using state-selected time-resolved dispersed fluorescence spectroscopy in a supersonic free jet expansion. These vibrational relaxation rate coefficients in the 2–12 K regime are found to be an order of magnitude smaller than comparable rate coefficients at 300 K. The rate data are compared with calculated classical I2–He encounter rates and with rates computed using quantum mechanical cross sections for I2–He calculated by Schwenke and Truhlar. The role of scattering resonances in determining vibrational relaxation rates at low translational temperatures is discussed.
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