933 lines
82 KiB
Text
933 lines
82 KiB
Text
<!DOCTYPE html>
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<html lang="en" dir="ltr" prefix="content: http://purl.org/rss/1.0/modules/content/ dc: http://purl.org/dc/terms/ foaf: http://xmlns.com/foaf/0.1/ og: http://ogp.me/ns# rdfs: http://www.w3.org/2000/01/rdf-schema# schema: http://schema.org/ sioc: http://rdfs.org/sioc/ns# sioct: http://rdfs.org/sioc/types# skos: http://www.w3.org/2004/02/skos/core# xsd: http://www.w3.org/2001/XMLSchema# ">
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<h2>NIST Standard Reference Database 119</h2><p><strong>Last Update to Data Content: June 2007 | </strong><a href="https://www.nist.gov/physical-measurement-laboratory/version-history"><strong>Version History</strong></a><strong> | </strong><a href="https://www.nist.gov/physical-measurement-laboratory/database-disclaimer"><strong>Disclaimer</strong></a><strong> | DOI: </strong><a href="https://dx.doi.org/10.18434/T45C7B"><strong>https://dx.doi.org/10.18434/T45C7B</strong></a></p><h2>Vibrational branching ratios and asymmetry parameters in the photoionization of CO<sub>2</sub> in the region between 650 Å and 840 Å</h2><p><br>A.C. Parr,<sup>1</sup> J.B. West,<sup>2</sup> M.R.F. King,<sup>2</sup> K. Ueda,<sup>3</sup> P.M. Dehmer,<sup>4</sup> J.L. Dehmer,<sup>5</sup> D.J. Schwab,<sup>6</sup> A.M. Sansonetti,<sup>6</sup> K. Olsen,<sup>6</sup> and R.A. Dragoset<sup>6</sup></p><p><sup>1</sup>Sensor Science Division, NIST, Gaithersburg, MD 20899, USA<br><sup>2</sup>Daresbury Laboratory, Warrington, WA4 4AD, UK<br><sup>3</sup>Research Institute for Scientific Measurements, Tohoku University, Sendai 980, Japan<br><sup>4</sup>Office of Basic Energy Science, U.S. Department of Energy, Germantown, MD 20874, USA<br><sup>5</sup>National Science Foundation, 4201 Wilson Blvd., Arlington, VA 22230, USA<br><sup>6</sup>Physical Measurement Laboratory, NIST, Gaithersburg, MD 20899, USA</p><hr><h2>Abstract</h2><p>The vibrational branching ratios and asymmetry parameters for CO<sub>2</sub> have been determined in the wavelength region of 650 Å to near the ionization onset at about 840 Å. The study was performed using synchrotron radiation from the Daresbury storage ring that was dispersed with a 5 m grating monochromator that afforded resolution of 0.1 Å to 0.2 Å. This resolution allowed the study of the branching ratios and asymmetry parameters with enough detail to see the changes in the parameters within the pronounced autoionization structure in CO<sub>2</sub> in this wavelength region. While the electron spectrometer resolution was not sufficient to resolve the spin orbit and Renner-Teller splitting in the photoelectron spectra, we are able to fit the data with a model that identifies the major structure in terms of the symmetric stretch and elements of the asymmetric stretch and bending modes. A calculation of the expected relative vibrational excitations based upon the Franck-Condon principle clearly showed non-Franck-Condon behavior in some of the vibrational-electronic transitions.</p><hr><h2>Table of Contents</h2><ol><li><a href="/pml/photoionization-co2-arpes/photoionization-co2-arpes-search-form" data-entity-type="node" data-entity-uuid="611ea89b-8d63-47b3-8cf9-e0f10f4a73b5" data-entity-substitution="canonical" title="Photoionization of CO2 (ARPES) Search Form">Search Form - Query the Database</a></li><li><a href="https://www.nist.gov/physical-measurement-laboratory/1-introduction">Introduction</a></li><li><a href="https://www.nist.gov/physical-measurement-laboratory/2-experimental-procedure">Experimental Procedure</a></li><li><a href="https://www.nist.gov/physical-measurement-laboratory/3-analysis-data">Analysis of the Data</a></li><li><a href="https://www.nist.gov/physical-measurement-laboratory/4-discussion">Discussion</a></li><li><a href="https://www.nist.gov/physical-measurement-laboratory/5-references">References</a></li><li><a href="https://www.nist.gov/physical-measurement-laboratory/figure-captions">List of Figures</a></li></ol><hr><p>NIST Standard Reference Database 119 | Online: November 2001 | Last Updated: June 2007 | <span class="spamspan"><span class="u">data</span> [at] <span class="d">nist.gov</span><span class="t"> (Customer Support)</span></span></p>
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Created August 14, 2009, Updated October 11, 2024
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