Angular distributions of ejected electrons from autoionizing 3 pnd states of magnesium

Journal Article · Thu Oct 01 04:00:00 EDT 1992 · Physical Review A. General Physics; (United States)

DOI:https://doi.org/10.1103/PhysRevA.46.3789· OSTI ID:7198588

Lindsay, M D; Dai, C; Cai, L; Gallagher, T F ^[1]; Robicheaux, F; Greene, C H ^[2]

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1. Department of Physics, University of Virginia, Charlottesville, Virginia 22901 (United States)
2. Joint Institute for Laboratory Astrophysics and Department of Physics, University of Colorado, Boulder, Colorado 80309 (United States)

We have measured the angular distributions of electrons ejected from doubly excited autoionizing Rydberg 3{ital pnd} {ital J}=1 and 3 states of magnesium, where {ital n}=10--18. To excite the aligned 3{ital snd} {sup 1}{ital D}{sub 2} states of Mg, we used two dye lasers crossed with an atomic beam. A third laser, linearly polarized in the same direction as the other two, excited the atoms in the 3{ital snd} states to the 3{ital pnd} states. The angular distributions of ejected electrons are given by {ital d}{sigma}/{ital d}{Omega}={ital tsum}{sub {ital k}a{ital k}P{ital k}}(cos{theta}), where {ital k}=0,2,4,6. We measured the angular distribution parameters {ital a}{sub {ital k}} as a function of the energy of the third laser photon using an electron detector and a Mg{sup +} ion detector. We compare our results with the predictions of an {ital R}-matrix multichannel quantum-defect theory. We find good agreement between experiment and theory.

• OSTI ID: 7198588
• Journal Information: Physical Review A. General Physics; (United States), Journal Name: Physical Review A. General Physics; (United States) Vol. 46:7; ISSN 1050-2947; ISSN PLRAA
• Country of Publication: United States
• Language: English

Related Subjects

664200* -- Spectra of Atoms & Molecules & their Interactions with Photons-- (1992-)
74 ATOMIC AND MOLECULAR PHYSICS
ALKALINE EARTH METALS
ANGULAR DISTRIBUTION
AUTOIONIZATION
COMPARATIVE EVALUATIONS
DISTRIBUTION
ELECTRON EMISSION
ELEMENTS
EMISSION
EVALUATION
IONIZATION
LASER SPECTROSCOPY
MAGNESIUM
MATRICES
METALS
R MATRIX
SPECTROSCOPY