I- CH3 X (X=Cl,Br,I) photodetachment: The effect of electron-molecule interactions in cluster anion photodetachment spectra and angular distributions

Matthew Van Duzor, Jie Wei, Foster Mbaiwa, Richard Mabbs

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

The electron kinetic energy dependence of the photoelectron spectra and angular distributions of I- CH3 X (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 CH3 X -electron interactions are revealed. In particular, the presence and energies of resonances associated with a low lying σ state have a marked effect on the results of I- CH3 X photoexcitation. These effects (vibrational excitation, product anion production, and alteration of the photoelectron angular distribution) are far more prominent for I- CH3 I. However, in the vicinity of the P2 1/2 threshold there is a sharp deviation in the P2 3/2 channel angular distribution and an enhancement of the P2 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.

Original languageEnglish
Article number144303
JournalJournal of Chemical Physics
Volume133
Issue number14
DOIs
Publication statusPublished - Oct 14 2010

Fingerprint

photodetachment
Angular distribution
Anions
angular distribution
anions
Molecules
Electrons
Photoelectrons
molecules
photoelectrons
electrons
interactions
Photoexcitation
photoexcitation
Kinetic energy
electron scattering
kinetic energy
deviation
Imaging techniques
Wavelength

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)
  • Physical and Theoretical Chemistry

Cite this

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title = "I- CH3 X (X=Cl,Br,I) photodetachment: The effect of electron-molecule interactions in cluster anion photodetachment spectra and angular distributions",
abstract = "The electron kinetic energy dependence of the photoelectron spectra and angular distributions of I- CH3 X (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 CH3 X -electron interactions are revealed. In particular, the presence and energies of resonances associated with a low lying σ state have a marked effect on the results of I- CH3 X photoexcitation. These effects (vibrational excitation, product anion production, and alteration of the photoelectron angular distribution) are far more prominent for I- CH3 I. However, in the vicinity of the P2 1/2 threshold there is a sharp deviation in the P2 3/2 channel angular distribution and an enhancement of the P2 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.",
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I- CH3 X (X=Cl,Br,I) photodetachment : The effect of electron-molecule interactions in cluster anion photodetachment spectra and angular distributions. / Van Duzor, Matthew; Wei, Jie; Mbaiwa, Foster; Mabbs, Richard.

In: Journal of Chemical Physics, Vol. 133, No. 14, 144303, 14.10.2010.

Research output: Contribution to journalArticle

TY - JOUR

T1 - I- CH3 X (X=Cl,Br,I) photodetachment

T2 - The effect of electron-molecule interactions in cluster anion photodetachment spectra and angular distributions

AU - Van Duzor, Matthew

AU - Wei, Jie

AU - Mbaiwa, Foster

AU - Mabbs, Richard

PY - 2010/10/14

Y1 - 2010/10/14

N2 - The electron kinetic energy dependence of the photoelectron spectra and angular distributions of I- CH3 X (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 CH3 X -electron interactions are revealed. In particular, the presence and energies of resonances associated with a low lying σ state have a marked effect on the results of I- CH3 X photoexcitation. These effects (vibrational excitation, product anion production, and alteration of the photoelectron angular distribution) are far more prominent for I- CH3 I. However, in the vicinity of the P2 1/2 threshold there is a sharp deviation in the P2 3/2 channel angular distribution and an enhancement of the P2 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.

AB - The electron kinetic energy dependence of the photoelectron spectra and angular distributions of I- CH3 X (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 CH3 X -electron interactions are revealed. In particular, the presence and energies of resonances associated with a low lying σ state have a marked effect on the results of I- CH3 X photoexcitation. These effects (vibrational excitation, product anion production, and alteration of the photoelectron angular distribution) are far more prominent for I- CH3 I. However, in the vicinity of the P2 1/2 threshold there is a sharp deviation in the P2 3/2 channel angular distribution and an enhancement of the P2 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.

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