Document Type
Article
Publication Date
5-2002
Publication Title
Physical Review Letters
Publisher
American Physical Society
Volume
88
Issue
20
First page number:
203002-1
Last page number:
203002-4
Abstract
We have observed photoexcitation of the dipole-forbidden 1s21S0→2p21D2 resonance in helium by measuring the nondipolar forward-backward asymmetry of photoelectron angular distributions in the 2ℓ2ℓ′ autoionizing region. By exploiting the electric dipole-quadrupole interference in the excitation of both the 2s2p1P1 and 2p21D2 levels, we have observed the quadrupole resonance in photoabsorption and extracted its Fano line shape parameters and the relative phase of the 1sEp and 1sEd continua. We find the quadrupole line profile index q2 to be markedly different from theoretical expectations.
Controlled Subject
Angular distribution (Nuclear physics); Conduction electrons; Dipole moments; Photoionization
Disciplines
Atomic, Molecular and Optical Physics | Inorganic Chemistry | Nuclear | Physical Chemistry
File Format
File Size
170 KB
Language
English
Permissions
Copyright American Physical Society. Used with permission.
Rights
IN COPYRIGHT. For more information about this rights statement, please visit http://rightsstatements.org/vocab/InC/1.0/
Repository Citation
Krassig, B.,
Kanter, E. P.,
Southworth, S. H.,
Guillemin, R.,
Hemmers, O.,
Lindle, D. W.,
Wehlitz, R.,
Martin, N. L.
(2002).
Photoexcitation of a Dipole-Forbidden Resonance in Helium.
Physical Review Letters, 88(20),
203002-1-203002-4.
https://digitalscholarship.unlv.edu/hrc_fac_articles/24
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Atomic, Molecular and Optical Physics Commons, Inorganic Chemistry Commons, Nuclear Commons, Physical Chemistry Commons