Spectroscopy and relaxation dynamics of I2Arn clusters. Geminate recombination and cluster fragmentation
Abstract
I2Arn clusters yield visible and near-UV emissions when excited to the states which correlate with the first ion-pair manifold of I2. These states may be accessed by 193 nm excitation of ground-state clusters, or near-UV excitation of electronically metastable I2(A' or A)Arm. Comparisons of the cluster and I2/Ar matrix spectra suggest that such excitations result in fragmentation and ``melting'' of the clusters prior to emission. 532 nm photodissociation of I2 within the clusters is followed by geminate recombination which populates the A', A, and X states. The probability for ejection of the recombined I2 from the clusters during the relaxation process appears to be size dependent. These results represent tentative steps towards the study of I(2P3/2)+I(2P3/2) recombination in Ar clusters. They also indicate that dissociation, recombination, and fragmentation processes may be used as a general method for generating metastable species in supersonic expansions.
- Publication:
-
Journal of Chemical Physics
- Pub Date:
- November 1992
- DOI:
- 10.1063/1.463716
- Bibcode:
- 1992JChPh..97.6057F