I-center dot CH3X (X=Cl, Br, I) photodetachment: The effect of electron-molecule interactions in cluster anion photodetachment spectra and angular distributions

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Author list: Van Duzor M, Wei J, Mbaiwa F, Mabbs R

Publisher: American Institute of Physics

Place: MELVILLE

Publication year: 2010

Journal: The Journal of Chemical Physics (0021-9606)

Journal acronym: J CHEM PHYS

Volume number: 133

Issue number: 14

Number of pages: 9

ISSN: 0021-9606

eISSN: 1089-7690

Languages: English-Great Britain (EN-GB)

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Abstract

The electron kinetic energy dependence of the photoelectron spectra and angular distributions of I-center dot CH3X (X=Cl, Br, I) cluster anions are measured via velocity mapped imaging at wavelengths between 350 and 270 nm. Processes analogous to those encountered in free CH3X-electron interactions are revealed. In particular, the presence and energies of resonances associated with a low lying sigma* state have a marked effect on the results of I-center dot CH3X photoexcitation. These effects (vibrational excitation, product anion production, and alteration of the photoelectron angular distribution) are far more prominent for I-center dot CH(3)l. However, in the vicinity of the P-2(1/2) threshold there is a sharp deviation in the P-2(3/2) channel angular distribution and an enhancement of the P-2(3/2) channel vibrational structure of all three cluster anions. These latter effects are specific to the cluster anion environment through the relaxation of the partner excited I atom and subsequent electronic autodetachment. (C) 2010 American Institute of Physics. [doi:10.1063/1.3487739]

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