ISSN:
1089-7690
Quelle:
AIP Digital Archive
Thema:
Physik
,
Chemie und Pharmazie
Notizen:
Isotopically labeled (benzene)13 clusters, (C6H6)(C6D6)12, were generated by supersonic expansion and studied as a function of nozzle-to-laser distance by resonance-enhanced two-photon ionization (R2PI) spectroscopy through the C6H6B2u←A1g601 transition. Because of the spectrum's simplicity, it serves as a sensitive monitor of the environment and dynamics of the C6H6 chromophore. We report experimental evidence for both evaporation and isomerization dynamics. Initially, the observed (C6H6)(C6D6)12 cluster population undergoes a transition from fluxional to rigid, resulting from the evaporation of a single C6D6 molecule from (C6H6)(C6D6)13. "Solidification" is followed by isomerization, in which the C6H6 moiety migrates from the surface of ordered, rigid clusters to their interior. The "freezing" temperature of (C6H6)(C6D6)12 is inferred to be near 137 K, in good agreement with theoretical simulations [Bartell and Dulles, J. Phys. Chem. 99, 17107 (1995)]. © 1998 American Institute of Physics.
Materialart:
Digitale Medien
URL:
http://dx.doi.org/10.1063/1.477499
