Picosecond mass-selective measurements of molecular cluster reactions: (CH3I)n à state excitation
✍ Scribed by J.A. Syage; J. Steadman
- Publisher
- Elsevier Science
- Year
- 1990
- Tongue
- English
- Weight
- 719 KB
- Volume
- 166
- Category
- Article
- ISSN
- 0009-2614
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✦ Synopsis
The picosecond reaction dynamics of (CHJ), clusters, initiated by A state excitation, were studied by molecular beam mass spectroscopy. Time-resolved measurements indicate that the prominent I2 and IZ(CH31)n_2 fragments are formed within the 10 ps limit of our resolution. The cluster dynamics and geometries allow for sequential loss of CHS radicals and substantial caging of fragment I atoms and recombined I7 molecules. Loss of up to five CHI radicals for cluster sizes n>8 occurs within the 25 ps excitation pulse duration as indicated by the presence of ion signals such as Is (CHJ) T. The evidence suggests that the extensive demethylation in the larger clusters is driven in part by the energy of intracluster recombination of two CHI radicals and the elimination of ethane.