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

Journal Article · Fri Sep 08 00:00:00 EDT 2006 · Physical Review Letters

DOI:https://doi.org/10.1103/PHYSREVLETT.97.103006· OSTI ID:20860786

Hemmers, O; Lindle, D W ^[1]; Guillemin, R; Wolska, A ^[1]; Rolles, D ^[2]; Kanter, E P; Kraessig, B; Southworth, S H ^[3]; Wehlitz, R ^[4]; Zimmermann, B ^[5]; McKoy, V ^[6]; Langhoff, P W ^[7]

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1. Department of Chemistry, University of Nevada, Las Vegas, Nevada 89154-4003 (United States)
2. Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, California 94720 (United States)
3. Argonne National Laboratory, Argonne, Illinois 60439 (United States)
4. Synchrotron Radiation Center, University of Wisconsin, Stoughton, Wisconsin 53589 (United States)
5. Max-Planck-Institute for the Physics of Complex Systems, Noethnitzer Strasse 38, D-01189 Dresden (Germany)
6. A. A. Noyes Laboratory of Chemical Physics, California Institute of Technology, Pasadena, California 91125 (United States)
7. San Diego Supercomputer Center, University of California, La Jolla, California 92093 (United States)

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 3{sigma}{sub g}, 1{pi}{sub u}, and 2{sigma}{sub u} shells of N{sub 2} exhibit spectral variations with incident photon energies from thresholds to {approx}200 eV which are attributed via concomitant calculations to particular final-state symmetry waves arising from (E1)(multiply-in-circle sign)(M1,E2) radiation-matter interactions first-order in photon momentum. Comparisons with previously reported K-edge studies in N{sub 2} 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.

• OSTI ID: 20860786
• Journal Information: Physical Review Letters, Vol. 97, Issue 10; Other Information: DOI: 10.1103/PhysRevLett.97.103006; (c) 2006 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0031-9007
• Country of Publication: United States
• Language: English

Related Subjects

74 ATOMIC AND MOLECULAR PHYSICS
ANGULAR DISTRIBUTION
E1-TRANSITIONS
E2-TRANSITIONS
INNER-SHELL IONIZATION
M1-TRANSITIONS
MATTER
NITROGEN
PHOTOIONIZATION
PHOTON BEAMS
PHOTONS
SYMMETRY