| Autor: |
Ryazanov, M., Rodrigo, C., Reisler, H. |
| Předmět: |
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| Zdroj: |
Journal of Chemical Physics; 2/28/2012, Vol. 136 Issue 8, p084305, 9p, 1 Diagram, 3 Charts, 2 Graphs |
| Abstrakt: |
The dissociation of the hydroxymethyl radical, CH2OH, and its isotopolog, CD2OH, following excitation in the 4ν1 region (OH stretch overtone, near 13 600 cm-1) was studied using sliced velocity map imaging. A new vibrational band near 13 660 cm-1 arising from interaction with the antisymmetric CH stretch was discovered for CH2OH. In CD2OH dissociation, D atom products (correlated with CHDO) were detected, providing the first experimental evidence of isomerization in the CH2OH ↔ CH3O (CD2OH ↔ CHD2O) system. Analysis of the H (D) fragment kinetic energy distributions shows that the rovibrational state distributions in the formaldehyde cofragments are different for the OH bond fission and isomerization pathways. Isomerization is responsible for 10%-30% of dissociation events in all studied cases, and its contribution depends on the excited vibrational level of the radical. Accurate dissociation energies were determined: D0(CH2OH → CH2O + H) = 10 160 ± 70 cm-1, D0(CD2OH → CD2O + H) = 10 135 ± 70 cm-1, D0(CD2OH → CHDO + D) = 10 760 ± 60 cm-1. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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