Partial photoionization cross sections and photoelectron angular distributions for double excitations up to the {ital N}=5 threshold in helium
- Department of Physics, University of Central Florida, Orlando, Florida 32816-2385 (United States)
- Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831-6201 (United States)
Partial photoionization cross sections {sigma}{sub {ital n}} and photoelectron angular distributions {beta}{sub {ital n}} were measured for all possible final ionic states He{sup +}({ital n}) in the region of the double excitations {ital N}({ital K},{ital T}){sup {ital A}} up to the {ital N}=5 threshold. At a photon energy bandpass of 12 meV below the thresholds {ital N}=3,4, and 5, this level of differentiation offers the most critical assessment of the dynamics of the two-electron excitations to date. The experimental data are very well described by the most advanced theoretical calculations. Weaker double-excitation series with {ital K}={ital N}{minus}4 are clearly visible in the {beta}{sub {ital n}} data, and even previously unobserved extremely weak series members with {ital A}={minus}1 can be discerned, showing the high sensitivity of the angular resolved measurements. The shapes of the resonance-induced variations of {sigma}{sub {ital n}} or {beta}{sub {ital n}} in the double excitations below a given threshold {ital N} change radically depending on the final ionic state {ital n} but display striking similarities when comparing the satellite states with {ital n}={ital N}{minus}1 and {ital n}={ital N}{minus}2 below each threshold {ital N}. These systematic patterns may indicate a general rule for the underlying two-electron dynamics. {copyright} {ital 1996 The American Physical Society.}
- Research Organization:
- Lawrence Berkeley National Laboratory
- DOE Contract Number:
- AC03-76SF00098
- OSTI ID:
- 383522
- Journal Information:
- Physical Review A, Journal Name: Physical Review A Journal Issue: 3 Vol. 54; ISSN 1050-2947; ISSN PLRAAN
- Country of Publication:
- United States
- Language:
- English
Similar Records
Double excitations of helium
Partial Photoionization Cross Sections and Angular Distributions for Double Excitation of Helium up to the N=13 Threshold
Dynamics of two-electron excitations in helium
Journal Article
·
Wed May 01 00:00:00 EDT 1996
· Bulletin of the American Physical Society
·
OSTI ID:394176
Partial Photoionization Cross Sections and Angular Distributions for Double Excitation of Helium up to the N=13 Threshold
Journal Article
·
Thu Dec 08 23:00:00 EST 2005
· Physical Review Letters
·
OSTI ID:20699671
Dynamics of two-electron excitations in helium
Technical Report
·
Mon Mar 31 23:00:00 EST 1997
·
OSTI ID:603601