corner
corner
APS » Journals » Phys. Rev. A » Volume 53 » Issue 6
< Previous Article | Next Article >

Phys. Rev. A 53, R3720–R3722 (1996)

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

Download: PDF (50 kB) Buy this article Export: BibTeX or EndNote (RIS)

R. Wehlitz1,*, R. Hentges2, G. Prümper2, A. Farhat3, T. Buslaps4, N. Berrah3, J. C. Levin1, I. A. Sellin1, and U. Becker2
1Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996-1200
2Fritz-Haber-Institut der Max-Planck-Gesellschaft, D-14195 Berlin, Germany
3Department of Physics, Western Michigan University, Kalamazoo, Michigan 49008-5151
4European Synchrotron Radiation Facility, Boîte Postal 220, F-38043 Grenoble Cedex, France

Received 5 February 1996; published in the issue dated June 1996

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±0.3)%, 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.

© 1996 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevA.53.R3720
DOI:
10.1103/PhysRevA.53.R3720
PACS:
32.80.Cy, 32.80.Fb

*Electronic address: wehlitz@utk.edu

 
< Previous Article | Next Article >