| Autor: |
Feng, Lin, Huang, Xin, Reisler, Hanna |
| Předmět: |
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| Zdroj: |
Journal of Chemical Physics; 9/8/2002, Vol. 117 Issue 10, p4820, 5p, 1 Diagram, 1 Chart, 3 Graphs |
| Abstrakt: |
The absorption spectrum and photodissociation dynamics of the hydroxymethyl radical via its two lowest excited electronic states, 3s and 3p[sub χ], are investigated in a supersonic molecular beam by the depletion, resonance enhanced multiphoton ionization, and photofragrnent yield spectroscopy methods. The measured origins of the electronic transitions to the 3s and 3p[sub χ] states agree with the most recent ab initio calculations. The vibronic bands of the 2 ²A'(3p[sub χ]) ← 1 ²A' transition are much broader than those of the transition terminating in the 2 ²A' (3p[sub z]) state, while the transition to the 1 ²A'(3s) state appears structureless. The investigation of the deuterated analog CH[sub 2]OD shows that near the onset of the transition to the 3s state, only the O-D bond fission pathway is important, while both H and D products are detected following excitation to the 3p[sub χ] state. The progressive broadening of the absorption features from the uppermost 3p[sup z] to the lowest 3s 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. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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