Threshold effects in I-center dot CH3CN and I-center dot H2O cluster anion detachment: The angular distribution as an indicator of electronic autodetachment

Journal article

Authors / Editors

Mbaiwa, Foster

Research Areas

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Publication Details

Author list: Mbaiwa F, Wei J, Van Duzor M, 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: 132

Issue number: 13

Number of pages: 9

ISSN: 0021-9606

eISSN: 1089-7690

Languages: English-Great Britain (EN-GB)

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Abstract

I-center dot H2O and I-center dot CH3CN cluster anion photodetachment properties (photoelectron spectra and angular distributions) are recorded via velocity mapped photoelectron imaging for wavelengths between 270 and 340 nm, in small energy increments. These are compared with free I- detachment results and reveal the presence of a sharp change in the angular distribution for the P-2(3/2) spin orbit channel in the vicinity of the P-2(1/2) threshold. The effect is seen at this threshold in the I-center dot H2O cluster anion and just below threshold for I-center dot CH3CN. The effect is attributed to an electronic autodetachment process, which is dependent on electronic energy transfer mediated by the electron-neutral complex produced in the excitation process. These results highlight the potential of cluster anion detachment as a probe of electron-molecule interactions and in particular the sensitivity of the angular distributions to intracluster electron transfer processes.

Keywords

electron detachment, iodine, molecular clusters, organic compounds, photoelectron spectra, WATER

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