Direct Measurement of the Transition Dipole Moment of the $\nu_{3}$ Asymmetric C-H Stretching Vibration of the Methyl Radical
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Date
1995
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Ohio State University
Abstract
A direct measurement of the transition dipole moment, $\mu_{3}$, of the $\nu_{3}$ asymmetric C-H stretching vibration of the methyl radical has been made in a transverse-flow reactor using laser-photolysis transient infrared absorption spectroscopy. Cyano (CN) radicals (and Cl atoms) were produced by excimer laser photolysis of ClCN at 193 nm and reacted with methane to give both $CH_{3}$ and HCN (and HCl). The intensities of 18 rotational lines of the $\nu_{3}$ fundamental band were measured relative to the R(8) line of the $\nu_{3}$ C-H stretching vibration of HCN. The transition dipole moment of the methyl radical was determined to be $\mu_{3} = 0.0327\pm 0.0027$ D using the known absolute absorption cross section of the $\nu_{3}$ vibration of HCN.
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Author Institution: "Gas Phase Dynamics Group, Chemistry Division Argonne National Laboratory", Argonne, Illinois 60439.