University of Illinois Urbana-Champaign

Anomalous Q branch intensity in the 2+1 rempi spectrum of the 1Π-1Σ+ transition in highly rotationally excited CO photofragments from OCS photodissociation at 215 nm

Gunthardt, Carolyn E.

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1146508.pptx
3124.pdf

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https://hdl.handle.net/2142/100538

Description

Title
Anomalous Q branch intensity in the 2+1 rempi spectrum of the 1Π-1Σ+ transition in highly rotationally excited CO photofragments from OCS photodissociation at 215 nm
Author(s)
Gunthardt, Carolyn E.
Contributor(s)
  • North, Simon
  • Hall, Gregory
  • Wallace, Colin J.
Issue Date
2018-06-20
Keyword(s)
Small molecules
Date of Ingest
  • 2018-08-17T16:09:07Z
  • 2018-12-12T22:39:05Z
Abstract
Nascent CO (X 1Σ +) photoproducts formed in the dissociation of OCS at 215 nm were probed using 2+1 resonance enhanced multiphoton ionization (REMPI) through the E 1Π state. This photodissociation produces a highly rotationally excited CO distribution, with fragment rotational levels ranging from J=48 to J=77. The resulting REMPI spectrum contains a prominent Q branch, despite negligible line strength factors for high J, two-photon, Π-Σ, Q branch transitions. The presence of a Q branch in the spectrum is explained by intensity borrowing from the nearby C 1Σ + state, as coupling between the C and E states is well documented, and two photon, Σ-Σ, Q branch transitions are intense for high J states. The observed relative intensities of the Q and S branch lines are well described by extrapolation to high J of the J-dependent mixing of C and E states inferred from the E state lambda doublet splittings at lower J. Improved De and Df constants have been derived through the incorporation of this high J data.
Publisher
International Symposium on Molecular Spectroscopy
Type of Resource
text
Genre of Resource
Conference Paper / Presentation
Language
eng
Permalink
http://hdl.handle.net/2142/100538
DOI
10.15278/isms.2018.WH02
Copyright and License Information
Copyright 2018 Carolyn E. Gunthardt

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Abstracts & Presentations - 2018 International Symposium on Molecular Spectroscopy PRIMARY