Frequency modulated circular dichroism spectroscopy: Application to ICN photolysis

Gus Hancock, Graham Richmond, G. A D Ritchie, Sarah Taylor, Matthew L. Costen, Gregory E. Hall

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Abstract

CN photofragments produced in the 248 nm photolysis of ICN are characterised by frequency-modulated absorption spectroscopy in the red A 2? ? X2S+ system. A range of high rotational states in both v = 0 and v = 1 were selected to isolate only those dissociation channels including coincident ground state I(2P 3/2). Velocity-resolved alignment and orientation parameters are determined from the observed Doppler profiles. The alignment measurements for both v = 0 and v = 1 levels are very similar, and consistent with dissociation occurring via three distinct pathways, beginning with simultaneous excitation of the 4A'(3?0+), 5A'(1?1) and 5A?(1?1) surfaces. While the incoherent alignment parameters for both v = 0 and v = 1 products are similar, the corresponding coherent orientation parameters are markedly different. CN (v = 0, N) exhibits a large positive orientation, whereas all rotational states probed in v = 1 show a much smaller orientation. This is consistent with the previously observed change in the sign of the coherent orientation parameter between v = 0 and v = 2. © 2010 Taylor & Francis.

Original languageEnglish
Pages (from-to)1083-1095
Number of pages13
JournalMolecular Physics
Volume108
Issue number7-9
DOIs
Publication statusPublished - Oct 2010

Keywords

  • Angular momentum
  • Coherent
  • ICN
  • Orientation
  • Photodissociation

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    Hancock, G., Richmond, G., Ritchie, G. A. D., Taylor, S., Costen, M. L., & Hall, G. E. (2010). Frequency modulated circular dichroism spectroscopy: Application to ICN photolysis. Molecular Physics, 108(7-9), 1083-1095. https://doi.org/10.1080/00268971003649323