Photoinduced Processes in Hydrogen Bonded System: Photodissociation of Imidazole Clusters

0341710 - ÚFCH JH 2011 RIV US eng J - Journal Article
Poterya, Viktoriya - Profant, V. - Fárník, Michal - Šištík, L. - Slavíček, P. - Buck, U.
Photoinduced Processes in Hydrogen Bonded System: Photodissociation of Imidazole Clusters.
Journal of Physical Chemistry A. Roč. 113, č. 52 (2009), s. 14583-14590. ISSN 1089-5639. E-ISSN 1520-5215
R&D Projects: GA AV ČR KAN400400651; GA AV ČR KJB400400902; GA ČR GA203/09/0422
Institutional research plan: CEZ:AV0Z40400503
Keywords : scattering analysis * molecules * imidazole clusters
Subject RIV: CF - Physical ; Theoretical Chemistry
Impact factor: 2.899, year: 2009

The photodissociation of imidazole in hydrogen bonded clusters has been studied at photodissociation wavelengths 243 and 193 nm. Imidazole clusters of different mean cluster sizes n approximate to 3 and 6 have been produced in expansions with He and Ar carrier gases, and the mean cluster sizes were determined by mass spectrometric and crossed beam scattering experiments. Simultaneously, the (C3N2H4)(n) clusters were studied by ab initio calculations for n up to 4 molecules, confirming the hydrogen bond N-H center dot center dot center dot N motif in the clusters. The measured H-fragment kinetic energy distribution spectra exhibit a bimodal character similar to the KEDs found for the bare molecule.(1) At 243 run the fast H-atoms originate from the direct dissociation process on the repulsive pi sigma* state, and the slow component results from the dynamics Populating the vibrationally hot ground state via all S-1/S-0 conical intersection.
Permanent Link: http://hdl.handle.net/11104/0005833