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Collisional removal of CH/sub 2/(/sup 1/A/sub 1/): absolute rate constants for atomic and molecular collisional partners at 295 K

Journal Article · · J. Chem. Phys.; (United States)
OSTI ID:6050146
The technique of cw laser resonance absorption has been used to monitor the time evolution of individual CH/sub 2/(/sup 1/A/sub 1/) rotational levels following the excimer laser photolysis of CH/sub 2/CO. Absolute rate constants for the removal of CH/sub 2/(/sup 1/A/sub 1/) by He, Ar, Kr, N/sub 2/, CO, O/sub 2/, CH/sub 4/, C/sub 2/H/sub 6/, C/sub 3/H/sub 8/, C/sub 2/H/sub 4/, i-C/sub 4/H/sub 8/, and CH/sub 2/CO have been determined at 295 K. Removal efficiencies range from nearly gas-kinetic for the higher hydrocarbons and CH/sub 2/CO to 10/sup -2/ for He. For He, Ar, and CH/sub 2/CO removal rates were measured for the v/sub 2/ = 1 excited bending vibrational level and found to be identical to the ground state rates. Pseudo-first-order rate constants for equilibration of the nascent rotational distribution in collisions with He and CH/sub 2/CO were found to be factors of 17 and 2.7 faster than the respective removal rates.
Research Organization:
Department of Chemistry, University of California
OSTI ID:
6050146
Journal Information:
J. Chem. Phys.; (United States), Journal Name: J. Chem. Phys.; (United States) Vol. 78:11; ISSN JCPSA
Country of Publication:
United States
Language:
English