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Rotationally resolved photoionization: Influence of the 4σ→kσ shape resonance on CO^+ (B^2Σ^+) rotational distributions

Farquar, George R. and Miller, J. Scott and Poliakoff, E. D. and Wang, Kwanghsi and McKoy, V. (2001) Rotationally resolved photoionization: Influence of the 4σ→kσ shape resonance on CO^+ (B^2Σ^+) rotational distributions. Journal of Chemical Physics, 115 (21). pp. 9764-9770. ISSN 0021-9606. https://resolver.caltech.edu/CaltechAUTHORS:20151027-154128740

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Abstract

We present experimental and theoretical results on rotational distributions of CO^+ (B^2Σ^+) photoions. Rotational distributions were determined for both the v^+=0 and v^+=1 vibrational levels following photoionization of cold (T_0≈9K) neutral CO target molecules. Data were generated using dispersed ionic fluorescence over a wide range of photoelectron kinetic energies, 0⩽E_k⩽120eV, which allows one to interrogate the ionization dynamics. This wide spectral coverage permits illustrative comparisons with theory, and calculated spectra are presented to interpret the data. In particular, the comparison between theory and experiment serves to identify the strong continuum resonant enhancement at hν_(exc)≈35eV in the l=3 partial wave of the 4σ→kσ ionization channel, as this feature has profound effects on the ion rotational distributions over a wide range of energy. Second, there are differences between the rotational substructure for the v^+=0 and v^+=1 vibrational levels. All of the experimentally observed features and trends are reproduced by theory, and the consequences of these comparisons are discussed.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1063/1.1415463DOIArticle
http://scitation.aip.org/content/aip/journal/jcp/115/21/10.1063/1.1415463PublisherArticle
Alternate Title:Rotationally resolved photoionization: Influence of the 4σ→kσ shape resonance on CO+ (B2Σ+) rotational distributions
Additional Information:© 2001 American Institute of Physics. (Received 10 May 2001; accepted 12 September 2001) The authors thank the CAMD staff for their assistance, and (E.D.P.) acknowledges support from NSF (Grant No. CHE-9616908). The work at Caltech was also supported in part by the National Science Foundation.
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Funding AgencyGrant Number
NSFCHE-9616908
Issue or Number:21
Record Number:CaltechAUTHORS:20151027-154128740
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20151027-154128740
Official Citation:Rotationally resolved photoionization: Influence of the 4σ→kσ shape resonance on CO+(B 2Σ+) rotational distributions Farquar, George R. and Miller, J. Scott and Poliakoff, E. D. and Wang, Kwanghsi and McKoy, V., The Journal of Chemical Physics, 115, 9764-9770 (2001), DOI:http://dx.doi.org/10.1063/1.1415463
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:61605
Collection:CaltechAUTHORS
Deposited By: George Porter
Deposited On:28 Oct 2015 18:14
Last Modified:03 Oct 2019 09:09

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