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

• Angular distributions of valence photoelectrons showing effects due to highermultipole photon interactions have been measured for the first time. Neon 2s and 2p photoemission exhibits effects beyond the dipole approximation throughout the 250 to 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.

Nyckelord

RANDOM-PHASE APPROXIMATION

DISTRIBUTION PARAMETERS

MULTIPOLE CORRECTIONS

LOW ENERGIES

PHOTOELECTRONS

PHOTOIONIZATION

RETARDATION

NATURAL SCIENCES

NATURVETENSKAP

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