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A generic π∗ shape resonance observed in energy-dependent photoelectron angular distributions from two-colour, resonant multiphoton ionization of difluorobenzene isomers
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Staniforth, Michael, Daly, Steven, Reid, Katharine L. and Powis, Ivan (2013) A generic π∗ shape resonance observed in energy-dependent photoelectron angular distributions from two-colour, resonant multiphoton ionization of difluorobenzene isomers. The Journal of Chemical Physics, Volume 139 (Number 6). Article number 064304. doi:10.1063/1.4817324 ISSN 0021-9606.
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Official URL: http://dx.doi.org/10.1063/1.4817324
Abstract
We present new evidence for the existence of a near threshold π* shape resonance as a common feature in the photoionization of each isomer of difluorobenzene. Experimentally, this is revealed by significant changes in the anisotropy of the photoelectron angular distributions (PADs) following the ionization of the optically aligned S1 state of these molecules at varying photon energies. Continuum multiple scattering Xα calculations reproduce this behaviour well, and allow the visualisation of the continuum shape resonances. The resonances are unusually narrow in energy (<1 eV), but nevertheless appear to extend right down to the ionization thresholds—exactly the low energy range typically accessed in laser-based resonance enhanced multiphoton ionization (REMPI) schemes. The anticipation of such pronounced energy dependence in the PADs and cross-sections sought for other molecules, and an ability to accurately predict such features, should be important for the reliable application and interpretation of experiments involving REMPI probing of those molecules.
Item Type: | Journal Article | ||||
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Divisions: | Faculty of Science, Engineering and Medicine > Science > Chemistry | ||||
Journal or Publication Title: | The Journal of Chemical Physics | ||||
Publisher: | American Institute of Physics | ||||
ISSN: | 0021-9606 | ||||
Official Date: | August 2013 | ||||
Dates: |
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Volume: | Volume 139 | ||||
Number: | Number 6 | ||||
Page Range: | Article number 064304 | ||||
DOI: | 10.1063/1.4817324 | ||||
Status: | Peer Reviewed | ||||
Publication Status: | Published | ||||
Access rights to Published version: | Open Access (Creative Commons) |
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