The initial vibrational level distribution and relaxation of HCN[{tilde {ital X}}{sup 1}{Sigma}{sup +}({ital v}{sub 1},0,{ital v}{sub 3})] in the CN({ital X}{sup 2}{Sigma}{sup +})+CH{sub 4}{r_arrow}HCN+CH{sub 3} reaction system
- Argonne National Laboratory, Chemistry Division, 9700 South Cass Avenue, Argonne, Illinois 60439 (United States)
The reaction of the cyano radical (CN) with methane was studied by time-resolved infrared absorption spectroscopy by monitoring individual rovibrational states of the HCN and CH{sub 3} products. The initial vibrational level distribution of the bendless vibrational levels of HCN({ital v}{sub 1},0,{ital v}{sub 3}) was determined by plotting the time dependence of the fractional population of a vibrational level and extrapolating these curves to the origin of time. About 20{percent} of the HCN products were observed to be initially produced in the HCN({ital v}{sub 1},0,{ital v}{sub 3}) vibrational levels, with {ital v}{sub 1} and {ital v}{sub 3}=0,1,2. The CN radical was created by laser photolysis of three different precursors. Each photolyte provided a different initial vibrational level distribution of CN; however, similar initial HCN({ital v}{sub 1},0,{ital v}{sub 3}) vibrational level distributions were obtained independent of the CN radical precursor. This may indicate that the CN radical does not act as a spectator bond during the course of a reactive encounter for this system. The time dependence of the CH{sub 3} (000{sup 0}0) ground state was also followed using time-resolved infrared absorption spectroscopy. Preliminary data indicates that a large fraction, if not all, the CH{sub 3} radicals are produced in their ground state in the title reaction. {copyright} {ital 1996 American Institute of Physics.}
- Research Organization:
- Argonne National Lab. (ANL), Argonne, IL (United States)
- DOE Contract Number:
- W-31109-ENG-38
- OSTI ID:
- 383093
- Journal Information:
- Journal of Chemical Physics, Vol. 105, Issue 11; Other Information: PBD: Sep 1996
- Country of Publication:
- United States
- Language:
- English
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