The absorption spectrum and photodissociation dynamics of the hydroxymethyl radical via its two lowest excited electronic states, and are investigated in a supersonic molecular beam by the depletion, resonance enhanced multiphoton ionization, and photofragment yield spectroscopy methods. The measured origins of the electronic transitions to the and states agree with the most recent ab initio calculations. The vibronic bands of the transition are much broader than those of the transition terminating in the state, while the transition to the state appears structureless. The investigation of the deuterated analog shows that near the onset of the transition to the state, only the O–D bond fission pathway is important, while both H and D products are detected following excitation to the state. The progressive broadening of the absorption features from the uppermost to the lowest excited state is explained based on recent calculations of surface couplings to lower electronic states. These couplings also control the photodissociation dynamics and the reaction outcomes.
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8 September 2002
Research Article|
September 08 2002
Photodissociative spectroscopy of the hydroxymethyl radical in the and states
Lin Feng;
Lin Feng
Department of Chemistry, University of Southern California, Los Angeles, California 90089-0482
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Xin Huang;
Xin Huang
Department of Chemistry, University of Southern California, Los Angeles, California 90089-0482
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Hanna Reisler
Hanna Reisler
Department of Chemistry, University of Southern California, Los Angeles, California 90089-0482
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J. Chem. Phys. 117, 4820–4824 (2002)
Article history
Received:
May 09 2002
Accepted:
June 14 2002
Citation
Lin Feng, Xin Huang, Hanna Reisler; Photodissociative spectroscopy of the hydroxymethyl radical in the and states. J. Chem. Phys. 8 September 2002; 117 (10): 4820–4824. https://doi.org/10.1063/1.1498469
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