Doubly excited states of helium observed in N- and l- specific partial photoionization cross-sections using lifetime-resolved fluorescence spectroscopy
Date
2003
Authors
Harries, James R
Sullivan, James
Obara, Satoshi
Hammond, Peter
Azuma, Yoshiro
Journal Title
Journal ISSN
Volume Title
Publisher
Institute of Physics Publishing
Abstract
We have used a lifetime-resolved fluorescence technique to obtain the first measurements of partial photoionization cross-sections of ground state neutral helium with both N- and l-specific final ion state separation. Structure is observed in the He 4lnl′ doubly excited state regions and the resulting resonance profiles and energy positions qualitatively compared to previously reported theoretical calculations. Due to the sensitive nature of the N- and l-specific partial cross-sections, states from the (4, -2)n series are observed for the first time.
Description
Keywords
Keywords: Approximation theory; Calculations; Fluorescence; Ground state; Helium; Photoionization; Poisson distribution; Spectroscopy; Fluorescence spectroscopy; Partial photoionization cross-sections; Atomic physics
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Source
Journal of Physics B: Atomic, Molecular and Optical Physics
Type
Journal article
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DOI
10.1088/0953-4075/36/19/L03
Restricted until
2037-12-31