Compton double-to-single ionization ratio of helium at 57 keV

Journal Article · Sat Jun 01 00:00:00 EDT 1996 · Physical Review A

DOI:https://doi.org/10.1103/PhysRevA.53.R3720· OSTI ID:286073

Wehlitz, R; Hentges, R; Pruemper, G; Farhat, A; Buslaps, T; Berrah, N; Levin, J C; Sellin, I A; Becker, U ^[1]

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1. Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996-1200 (United States)

We have measured the Compton double-to-single ionization ratio of helium using an ion time-of-flight spectrometer along with monochromatized synchrotron radiation of 57 keV. This photon energy is high and probes the Compton ionization alone, since the photoionization makes only a negligible contribution to the total cross section. Comparing our result, which is (1.25{plus_minus}0.3){percent}, with theoretical calculations and measurements at lower energies shows that this energy is most likely still not high enough to confirm the value of the asymptotic high-energy limit experimentally. {copyright} {ital 1996 The American Physical Society.}

• DOE Contract Number: FG02-92ER14299
• OSTI ID: 286073
• Journal Information: Physical Review A, Vol. 53, Issue 6; Other Information: PBD: Jun 1996
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
HELIUM
PHOTOIONIZATION
PHOTON-ATOM COLLISIONS
TIME-OF-FLIGHT SPECTROMETERS
KEV RANGE 10-100
IONIZATION POTENTIAL
COMPTON EFFECT