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LETTER TO THE EDITOR

Beyond the dipole approximation: angular-distribution effects in valence photoemission

O Hemmers et al 1997 J. Phys. B: At. Mol. Opt. Phys. 30 L727-L733   doi: 10.1088/0953-4075/30/21/003  Help

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O Hemmers-+, G Fisher-+, P Glans-+, D L Hansen-+, H Wang-+, S B Whitfield-+, R Wehlitz++, J C Levin++, I A Sellin++, R C C Perera§, E W B Dias||, H S Chakraborty||, P C Deshmukh||, S T Manson and D W Lindle-+
-+ Department of Chemistry, University of Nevada, Las Vegas, NV 89154-4003, USA
++ Department of Physics and Astronomy, University of Tennessee, Knoxville, TN 37996-1200, USA
§ Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA
|| Department of Physics, Indian Institute of Technology-Madras, Madras-600036, India
¶ Department of Physics, Georgia State University, Atlanta, GA 30303, USA

Abstract. Angular distributions of valence photoelectrons showing effects due to higher-multipole photon interactions have been measured for the first time. Neon 2s and 2p photoemission exhibits effects beyond the dipole approximation throughout the 250 - 1200 eV photon-energy range studied. The results suggest that any photoemission experiment, on any sample, can be affected at relatively low photon energies, pointing to a general need for caution in interpreting angle-resolved-photoemission measurements.

Print publication: Issue 21 (14 November 1997)
Received 5 August 1997, in final form 25 September 1997

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