학술논문
Photofragmentation of I2-·Arn clusters: Observation of metastable isomeric ionic fragments.
Document Type
Article
Source
Subject
*IODINE
*MICROCLUSTERS
*IONIC solutions
*
*
Language
ISSN
0021-9606
Abstract
We report the 790 nm photofragmentation of mass-selected I-2·Arn clusters, n=1 to 27. We determine the I-+I caging efficiency as a function of the number of solvent Ar atoms and compare these results with I-2 in CO2 clusters. Caging is much less effective with Ar. In addition to ‘‘normal’’ caged photoproducts (I-2·Arm, where m=5 μs. This unusual photofragment exists either as a trapped excited electronic state or as a solvent-separated pair at an internuclear separation of ∼5.5 Å. The photofragmentation data also exhibit the existence of two distinct isomeric forms of the precursor I-2·Arn, for n≤14. These forms are evaporatively distinct in that one isomer displays highly nonstatistical fragmentation, probably arising from a cluster in which the I-2 resides on the surface, rather than in the interior. The photofragmentation distribution of the other form exhibits statistical behavior, consistent with the evaporation of an I-2 solvated inside the cluster. © 1996 American Institute of Physics. [ABSTRACT FROM AUTHOR]