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Low-Energy Nondipole Effects in Molecular Nitrogen Valence-Shell Photoionization

Hemmers, O. and Guillemin, R. and Rolles, D. and Wolska, A. and Lindle, D. W. and Kanter, E. P. and Krässig, B. and Southworth, S. H. and Wehlitz, R. and Zimmermann, B. and McKoy, V. and Langhoff, P. W. (2006) Low-Energy Nondipole Effects in Molecular Nitrogen Valence-Shell Photoionization. Physical Review Letters, 97 (10). Art. No. 103006. ISSN 0031-9007. doi:10.1103/PhysRevLett.97.103006.

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Observations are reported for the first time of significant nondipole effects in the photoionization of the outer-valence orbitals of diatomic molecules. Measured nondipole angular-distribution parameters for the 3sigmag, 1piu, and 2sigmau shells of N2 exhibit spectral variations with incident photon energies from thresholds to ~200 eV which are attributed via concomitant calculations to particular final-state symmetry waves arising from (E1)[direct-product](M1,E2) radiation-matter interactions first-order in photon momentum. Comparisons with previously reported K-edge studies in N2 verify linear scaling with photon momentum, accounting in part for the significantly enhanced nondipole behavior observed in inner-shell ionization at correspondingly higher momentum values in this molecule.

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Additional Information:©2006 The American Physical Society (Received 2 June 2006; published 7 September 2006) We acknowledge support of the ANL group by the Chemical Sciences, Geosciences, and Biosciences Division of the Office of Basic Energy Sciences, Office of Science, U.S. Department of Energy, Contract No. W-31-109-Eng-38 and of the UNLV group by NSF Grant No. PHY-01-40375. The University of Wisconsin SRC is supported by NSF Grant No. DMR-0084402, and the ALS (LBNL) was supported by DOE Materials Science Division, BES, OER under Contract No. DE-AC03-76SF00098.
Issue or Number:10
Record Number:CaltechAUTHORS:HEMprl06
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ID Code:5125
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Deposited On:02 Oct 2006
Last Modified:08 Nov 2021 20:22

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