7 June 1999 I(2P1/2)+O2: studies of low-temperature electronic energy transfer and nuclear spin state changing collisions
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Hyperfine level relaxation of I2P1/2 by O2(X), 12P1/2(P=2) + 02(X) I ^^=3) + 02(X) and electronic quenching of I 2P ./2 by 02(X) were investigated over the temperature range 10 - 295 K. The hyperfine transfer rate constants were found to be insensitive to temperature over this range. At room temperature the rate constants for hyperfine transfer and quenching were comparable, but the latter decreased with decreasing temperature. The energy transfer rate constants obtained in this study were smaller than estimates currently used in computational models of chemical oxygen iodine lasers. The measurement technique reported here relies on the fact that photolysis of I2 via the #3n(0u+) state produces 12P1/2 atoms with non-statistical population of the hyperfine sub-levels. The photolysis wavelength and temperature dependence of the product state distribution was investigated. The results suggest that avoided crossings between the potential energy curves of I2 at large intemuclear distances are responsible for the anomalous hyperfine sub-level population distributions. Key words: Energy transfer, hyperfine level relaxation, chemical oxygen iodine laser, COIL, photodissociation dynamics.
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Todd A. Van Marter, Todd A. Van Marter, Michael C. Heaven, Michael C. Heaven, "I(2P1/2)+O2: studies of low-temperature electronic energy transfer and nuclear spin state changing collisions", Proc. SPIE 3612, Gas and Chemical Lasers and Intense Beam Applications II, (7 June 1999); doi: 10.1117/12.350648; https://doi.org/10.1117/12.350648

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