Solvent-Induced Photostability of Acetylene Molecules in Clusters Probed by Multiphoton Dissociation

0333706 - ÚFCH JH 2010 RIV US eng J - Journal Article
Fárník, Michal - Poterya, Viktoriya - Votava, Ondřej - Ončák, Milan - Slavíček, P. - Dauster, I. - Buck, U.
Solvent-Induced Photostability of Acetylene Molecules in Clusters Probed by Multiphoton Dissociation.
Journal of Physical Chemistry A. Roč. 113, č. 26 (2009), s. 7322-7330. ISSN 1089-5639. E-ISSN 1520-5215
R&D Projects: GA AV ČR KAN400400651; GA MŠMT LC512
Institutional research plan: CEZ:AV0Z40400503
Keywords : surface * C2H2 * photostability
Subject RIV: CF - Physical ; Theoretical Chemistry
Impact factor: 2.899, year: 2009

We have studied the multiphoton photodissociation of (C2H2)n and (C2H2)n• Arm clusters in molecular beams. The clusters were prepared in supersonic expansions under various conditions, and the corresponding mean cluster sizes were determined, for which the photodissociation at 193 nm was studied. The measured kinetic energy distributions (KEDs) of the H fragment from acetylene in clusters peak around 0.2 eV, in agreement with the KED from an isolated C2H2 molecule. However, the KEDs from the clusters extend to kinetic energies of over 2 eV, significantly higher than the maximum fragment energies from an isolated molecule of about 1 eV. The photofragment acceleration upon solvation is a rather unusual phenomenon.
Permanent Link: http://hdl.handle.net/11104/0005573