Angular resolved studies of the Lyman-α photodissociation of HCN and DCN: New dynamical insights
| Autor: | Phillip A. Cook, Richard N. Dixon, Stephen R. Langford, Michael N. R. Ashfold |
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| Rok vydání: | 2000 |
| Předmět: | |
| Zdroj: | The Journal of Chemical Physics. 113:994-1004 |
| ISSN: | 1089-7690 0021-9606 |
| DOI: | 10.1063/1.481880 |
| Popis: | The photochemistries of HCN and DCN at the H(D) Lyman-α wavelength have been reinvestigated using the technique of H(D) Rydberg atom time-of-flight spectroscopy, with angular resolution of the H/D atom signal about the polarization vector of the photolysis radiation. In the case of HCN photodissociation, the previous assignment of substantial branching to H+CN(A 2Π)v=0 products is confirmed. Analysis of the profile taken under parallel polarization of the Lyman-α radiation relative to the time of flight axis reveals additional structure attributable both to a progression in CN(A) products with high rovibrational excitation (v=4–9, with N∼26–41, for all v), and to various rotationally excited levels associated with CN(B 2Σ+)v=0,1. From these various assignments an improved value for the dissociation energy, D0(H–CN)=43 710±70 cm−1, is obtained. The determined β parameter, which is a measure of the angular part of the photofragment velocity distribution about the polarization vector of the photolysis radiat... |
| Databáze: | OpenAIRE |
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