Partial Photoionization Cross Sections and Angular Distributions for Double Excitation of Helium up to the N=13 Threshold
Journal Article
·
· Physical Review Letters
- Institut fuer Kernphysik, Universitaet Frankfurt, D-60438 Frankfurt (Germany)
- Max-Planck-Institut fuer Physik komplexer Systeme, D-01187 Dresden (Germany)
- Fu Jen Catholic University, Taipei, Taiwan (China); and others
Partial photoionization cross sections {sigma}{sub N}(E{sub {gamma}}) and photoelectron angular distributions {beta}{sub N}(E{sub {gamma}}) were measured for the final ionic states He{sup +}(N>4) in the region between the N=8 and N=13 thresholds (E{sub {gamma}}>78.155 eV) using the cold target recoil ion momentum spectroscopy technique (COLTRIMS). Comparison of the experimental data with two independent sets of theoretical predictions reveals disagreement for the branching ratios to the various He{sub N}{sup +} states. The angular distributions just below the double ionization threshold suggest an excitation process for highly excited N states similar to the Wannier mechanism for double ionization.
- OSTI ID:
- 20699671
- Journal Information:
- Physical Review Letters, Vol. 95, Issue 24; Other Information: DOI: 10.1103/PhysRevLett.95.243003; (c) 2005 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0031-9007
- Country of Publication:
- United States
- Language:
- English
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