Intramolecular electron transfer in a molecular beam
| Autor: | Dutch D. Chung, Donald H. Levy, Basil Paulson, G. L. Closs, Mita Chattoraj, Sandra L. Laursen |
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| Rok vydání: | 1992 |
| Předmět: | |
| Zdroj: | The Journal of Physical Chemistry. 96:8778-8784 |
| ISSN: | 1541-5740 0022-3654 |
| DOI: | 10.1021/j100201a019 |
| Popis: | Gas-phase intramolecular electron transfer was studied in molecules of the type D-Sp-A where D was a positive charge donor A was a positive charge acceptor, and Sp was a rigid, inert spacer. In our experiments, the donor was always naphthalene the acceptors were benzene, indole, and biphenyl, and the spacers were cyclohexane and androstane. The naphthalene chromophore was selectively ionized by means of resonantly enhanced two-photon ionization via the naphthalene S{sub 1} state. The location of the charge was monitored by observing the resonantly enhanced multiphoton dissociation spectrum of the ion. When the charge was localized on the naphthalene, the naphthalene ion D{sub 2} {l_arrow} D{sub 0} spectrum was observed as an active spectrum (ion yield at a given mass versus wavenumber). When the charge had transferred to the acceptor, the naphthalene ion spectrum was not observed. Using this technique we attempted to measure the charge-transfer lifetime by measuring the intensity of the naphthalene ion action spectrum as a function of the delay between the ionizing and dissociating lasers. We found that in all cases where charge transfer was thermodynamically possible, the charge-transfer lifetime was less than 2 ns, the time resolution of the experiment. 39 refs., 12 figs., 2more » tabs.« less |
| Databáze: | OpenAIRE |
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