Threshold effects in I- CH3 CN and I- H2 O cluster anion detachment
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Subtitle: The angular distribution as an indicator of electronic autodetachment
Author list: Mbaiwa, Foster
Publisher: AIP Publishing
Publication year: 2010
Journal: The Journal of Chemical Physics (0021-9606)
Volume number: 132
Issue number: 13
Start page: 134304
ISSN: 0021-9606
eISSN: 1089-7690
URL: https://aip.scitation.org/doi/abs/10.1063/1.3380664
Languages: English-United States (EN-US)
Abstract
I- H2 O and I- CH3 CN 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 P2 3/2 spin orbit channel in the vicinity of the P2 1/2 threshold. The effect is seen at this threshold in the I- H2 O cluster anion and just below threshold for I- CH3 CN. 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.
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