Files in this item

FilesDescriptionFormat

application/vnd.openxmlformats-officedocument.presentationml.presentation

application/vnd.openxmlformats-officedocument.presentationml.presentation1146508.pptx (18MB)
PresentationMicrosoft PowerPoint 2007

application/pdf

application/pdf3124.pdf (19kB)
AbstractPDF

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.
Subject(s):Small molecules
Abstract:Nascent CO (X $^{1}$$\Sigma$$^{+}$) photoproducts formed in the dissociation of OCS at 215 nm were probed using 2+1 resonance enhanced multiphoton ionization (REMPI) through the E $^{1}$$\Pi$ state. This photodissociation produces a highly rotationally excited CO distribution, with fragment rotational levels ranging from J=48 to J=77. The resulting REMPI spectrum contains a prominent Q branch, despite negligible line strength factors for high J, two-photon, $\Pi$-$\Sigma$, Q branch transitions. The presence of a Q branch in the spectrum is explained by intensity borrowing from the nearby C $^{1}$$\Sigma$$^{+}$ state, as coupling between the C and E states is well documented, and two photon, $\Sigma$-$\Sigma$, 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 D$_{e}$ and D$_{f}$ constants have been derived through the incorporation of this high J data.
Issue Date:06/20/18
Publisher:International Symposium on Molecular Spectroscopy
Citation Info:APS
Genre:Conference Paper / Presentation
Type:Text
Language:English
URI:http://hdl.handle.net/2142/100538
DOI:10.15278/isms.2018.WH02
Other Identifier(s):WH02
Date Available in IDEALS:2018-08-17
2018-12-12


This item appears in the following Collection(s)

Item Statistics