Stereochemical and angular momentum constraints in the photodissociation of ammonia
| Autor: | K. H. Welge, Richard N. Dixon, W. Meier, H.-m. Koeppe, Michael N. R. Ashfold, S. J. Irving, L. Schnieder, J. R. Nightingale |
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| Rok vydání: | 1990 |
| Předmět: | |
| Zdroj: | Philosophical Transactions of the Royal Society of London. Series A: Physical and Engineering Sciences. 332:375-386 |
| ISSN: | 2054-0299 0962-8428 |
| DOI: | 10.1098/rsta.1990.0121 |
| Popis: | Time-of-flight spectra of the nascent H atoms, and laser induced fluorescence excitation spectra of the nascent NH 2 radicals, are leading to a very complete knowledge of the energy disposal following photodissociation of NH 3 through its A 1 A 2 excited state. Both the dissociation rates and the product distributions are sensitive to the values of the vibrational and rotational quantum numbers of the quasi-bound levels of the parent molecule. The most populated fragment states involve the a-axis rotational, and bending vibrational, motions of the NH2 with modest excitation of further rotational degrees of freedom at low internal energy. For most NH 2 internal states the accompanying H atoms recoil close to the initial plane of NH 3 excitation, but for a specific subset of product states the H atoms recoil perpendicular to this plane. These measurements and their interpretation give a detailed insight into the intramolecular motion of the dissociating NH3 molecule, which is dynamically controlled but yet involves most of the internal degrees of freedom. |
| Databáze: | OpenAIRE |
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