Direct measurement of the transition dipole moment of the {ital v}{sub 3} asymmetric C--H stretching vibration of the CH{sub 3} radical
- Chemistry Division, Argonne National Laboratory, Argonne, Illinois 60439 (United States)
A direct measurement of the transition dipole moment, {mu}{sub 3}, of the degenerate {ital v}{sub 3} in-plane asymmetric C--H stretching vibration of the methyl radical has been made. The measurements were carried out in a flow reactor using laser-photolysis transient infrared absorption spectroscopy. Cyano (CN) radicals (and Cl atoms) were produced by laser photolysis of BrCN (or ClCN) at 193 nm and reacted with methane to give both CH{sub 3} and HCN (and HCl). The intensities of 18 rotational lines of the {ital v}{sub 3} fundamental band were measured relative to the {ital R}(8) line of the C--H stretching vibration ({ital v}{sub 3}) of HCN(001{l_arrow}0). The best estimate of the transition dipole moment of the CH{sub 3} (001{sup 1}0{l_arrow}0) transition was provided by the measured line intensity for the CH{sub 3} (001{sup 1}0{l_arrow}0){sup {ital rR}}(3,3) transition and was determined to be {mu}{sub 3}=0.0327{plus_minus}0.0021 D. {copyright} {ital 1995} {ital American} {ital Institute} {ital of} {ital Physics}.
- Research Organization:
- Argonne National Laboratory (ANL), Argonne, IL
- DOE Contract Number:
- W-31109-ENG-38
- OSTI ID:
- 91890
- Journal Information:
- Journal of Chemical Physics, Journal Name: Journal of Chemical Physics Journal Issue: 8 Vol. 103; ISSN JCPSA6; ISSN 0021-9606
- Country of Publication:
- United States
- Language:
- English
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