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- Title
Vibrational Relaxation and Fragmentation in Icosahedral (Ar<sub>2</sub><sup>+</sup>)Ar<sub>12</sub> Clusters.
- Authors
Jongbaik Ree; Yoo Hang Kim; Hyung Kyu Shin
- Abstract
A dynamics study of relaxation and fragmentation of icosahedral argon cluster with a vibrationally excited Ar2 (v) is presented. Local translation is shown to be responsible for inducing energy flow from the embedded ion to host atoms and fragmentation of the cluster consisting of various low frequency modes. The total potential energy of (Ar2+)Ar12 is formulated using a building-up procedure of host-guest and host-host interactions. The time dependence of ion-to-host energy transfer is found to be tri-exponential, with the short-time process of ~100 ps contributing most to the overall relaxation process. Relaxation timescales are weakly dependent on both temperature (50-300 K) and initial vibrational excitation (v = 1-4). Nearly 27% of host atoms in the cluster with Ar2 + (v = 1) fragment immediately after energy flow, the extent increasing to ~43% for v =4. The distribution of fragmentation products of (Ar2+)Ar12 → (Ar2+)Arn + (12-n)Ar are peaked around (Ar2+)Ar8. The distribution of dissociation times reveals fragmentation from one hemisphere dominates that from the other. This effect is attributed to the initial fragmentation causing a sequential perturbation of adjacent atoms on the same icosahedral five-atom layer.
- Subjects
POTENTIAL energy; ENERGY transfer; VIBRATIONAL relaxation (Molecular physics); ATOMIC excitation; MICROCLUSTERS
- Publication
Bulletin of the Korean Chemical Society, 2014, Vol 35, Issue 9, p2774
- ISSN
0253-2964
- Publication type
Article
- DOI
10.5012/bkcs.2014.35.9.2774