Angle-velocity-resolved measurements of I(2P3/2,1/2) from (CH3I)n cluster photodissociation at 266 and 304 nm
✍ Scribed by Jack A. Syage
- Publisher
- Elsevier Science
- Year
- 1995
- Tongue
- English
- Weight
- 703 KB
- Volume
- 245
- Category
- Article
- ISSN
- 0009-2614
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✦ Synopsis
The angle-velocity distribution of I(2P3/2) and I(2131/2) from photodissociation of (CH3I) n clusters was measured at 266 and 304 nm. For the monomer (n = 1), the angular distribution is very anisotropic and the translational energy spectrum is sharply peaked at high energy. For clusters (predominantly n = 2, 3), the I atom undergoes collisions, which substantially relax the translational energy and anisotropy. Three observations are reported. (1) A residual anisotropy exists in cluster photodissociation that increases with increasing fragment translational energy. (2) The I atom 2p3/2 to 2pI/2 branching ratio increases significantly in clusters relative to monomer. (3) TOF spectra were observed for I atoms originating from photodissociation of the cluster photoproduct 12. These observations are discussed in terms of a caging of I atoms that may either react or escape from the cluster.