| Autor: |
Rubio-Lago, L., Amaral, G. A., Oldani, A. N., Rodríguez, J. D., González, M. G., Pino, G. A., Bañares, L. |
| Zdroj: |
Physical Chemistry Chemical Physics (PCCP); Jan2011, Vol. 13 Issue 3, p1082-1091, 10p |
| Abstrakt: |
The photodissociation dynamics of pyrrole–ammoniaclusters (PyH·(NH3)n, n = 2–6) has been studied using a combination of velocity map imaging and non-resonant detection of the NH4(NH3)n−1 products. The excited state hydrogen-atom transfer mechanism (ESHT) is evidenced through delayed ionization and presents a threshold around 236.6 nm, in agreement with previous reports. A high resolution determination of the kinetic energy distributions (KEDs) of the products reveals slow (∼0.15 eV) and structured distributions for all the ammoniacluster masses studied. The low values of the measured kinetic energy rule out the existence of a long-lived intermediate state, as it has been proposed previously. Instead, a direct N–H bond rupture, in the fashion of the photodissociation of bare pyrrole, is proposed. This assumption is supported by a careful analysis of the structure of the measured KEDs in terms of a discrete vibrational activity of the pyrrolyl co-fragment. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
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