Observation of large quadrupolar effects in a slow photoelectron imaging experiment

We have studied nondipolar effects in resonance-enhanced multiphoton ionization of Xe and have observed an azimuthal dependence of the photoelectron angular distribution on a quadrupole resonance, as well as a very large asymmetry with respect to the direction of the laser propagation close to the r...

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Bibliographic Details
Published in:Physical review letters 2004-12, Vol.93 (23), p.233003.1-233003.4, Article 233003
Main Authors: LEPINE, F, ZAMITH, S, DE SNAIJER, A, BORDAS, Ch, VRAKKING, M. J. J
Format: Article
Language:English
Subjects:
Atomic and molecular physics
Atomic Physics
Atomic properties and interactions with photons
Electron, ion spectrometers and related techniques
Exact sciences and technology
Instruments, apparatus, components and techniques common to several branches of physics and astronomy
Multiphoton ionization and excitation to highly excited states (e.g., rydberg states)
Multiphoton ionization and excitation to highly excited states (eg, Rydberg states)
Photon interactions with atoms
Physics
Zeeman and stark effects
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Summary:We have studied nondipolar effects in resonance-enhanced multiphoton ionization of Xe and have observed an azimuthal dependence of the photoelectron angular distribution on a quadrupole resonance, as well as a very large asymmetry with respect to the direction of the laser propagation close to the resonance, which is understood in terms of interference between dipole- and quadrupole-allowed ionization channels. The observed asymmetry in the photoelectron angular distribution provides insight into the ejection of slow photoelectrons near an ionization threshold.
ISSN:0031-9007
1079-7114
DOI:10.1103/PhysRevLett.93.233003