High-energy behavior of the double photoionization of helium from 2 to 12 keV

Journal Article · Fri Jan 01 04:00:00 EST 1993 · Physical Review A; (United States)

DOI:https://doi.org/10.1103/PhysRevA.47.R16· OSTI ID:6887816

Levin, J C ^[1]; Sellin, I A ^[2]; Johnson, B M ^[3]; Lindle, D W ^[4]; Miller, R D ^[2]; Berrah, N ^[5]; Azuma, Y; Berry, H G ^[6]; Lee, D ^[7]

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1. National Institute of Standards and Technology, Gaithersburg, Maryland 20899 (United States)
2. Department of Physics, University of Tennessee, Knoxville, Tennessee 37996-1200 (United States) Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831-6377 (United States)
3. Department of Applied Science, Brookhaven National Laboratory, Upton, New York 11973 (United States)
4. Department of Chemistry, University of Nevada, Las Vegas, Nevada 89154 (United States)
5. Department of Physics, Western Michigan University, Kalamazoo, Michigan 49008 (United States)
6. Physics Division, Argonne National Laboratory, Argonne, Illinois 60439 (United States)
7. Department of Applied Science, Brookhaven National L

We report the ratio of double-to-single photoionization of He at several photon energies from 2 to 12 keV. By time-of-flight methods, we find a ratio consistent with an asymptote at 1.5%[plus minus]0.2%, essentially reached by [ital h][nu][approx]4 keV. Fair agreement is obtained with older shake calculations of Byron and Joachain [Phys. Rev. 164, 1 (1967)], of Aberg [Phys. Rev. A 2, 1726 (1970)], and with recent many-body perturbation theory (MBPT) of Ishihara, Hino, and McGuire [Phys. Rev. A 44, 6980 (1991)]. The result lies below earlier MPBT calculations by Amusia [ital et] [ital al]. [J. Phys. B 8, 1248 (1975)] (2.3%), and well above semiempirical predictions of Samson [Phys. Rev. Lett. 65, 2861 (1990)], who expects no asymptote and predicts [sigma](He[sup 2+])/[sigma](He[sup +])=0.3% at 12 keV.

• DOE Contract Number: AC05-84OR21400; W-31109-ENG-38; AC02-76CH00016
• OSTI ID: 6887816
• Journal Information: Physical Review A; (United States), Journal Name: Physical Review A; (United States) Vol. 47:1; ISSN 1050-2947; ISSN PLRAAN
• Country of Publication: United States
• Language: English

Related Subjects

664400* -- Experimentally Derived Information on Atomic & Molecular Properties-- (1992-)
74 ATOMIC AND MOLECULAR PHYSICS
ATOM COLLISIONS
BREMSSTRAHLUNG
COLLISIONS
ELECTROMAGNETIC RADIATION
ELEMENTS
ENERGY DEPENDENCE
ENERGY RANGE
FLUIDS
GASES
HELIUM
IONIZATION
KEV RANGE
KEV RANGE 01-10
MONOCHROMATIC RADIATION
NONMETALS
PHOTOIONIZATION
PHOTON COLLISIONS
PHOTON-ATOM COLLISIONS
RADIATIONS
RARE GASES
SYNCHROTRON RADIATION
TIME-OF-FLIGHT METHOD