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LETTER TO THE EDITOR

The Wannier threshold law examined by photoelectron satellite measurements

R Wehlitz et al 1999 J. Phys. B: At. Mol. Opt. Phys. 32 L635-L641   doi: 10.1088/0953-4075/32/22/101  Help

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R Wehlitz-+, M-T Huang-+, I A Sellin++ and Y Azuma-+
-+ Photon Factory, Institute of Materials Structure Science, KEK, Tsukuba, Ibaraki 305-0801, Japan
++ Department of Physics and Astronomy, University of Tennessee, Knoxville, TN 37996-1200, USA

Abstract. We have tested the Wannier threshold law employing a new experimental approach using an electron time-of-flight spectrometer. From the measured relative intensities of the helium He+(nell) photoelectron satellites (nleq9) near the double-photoionization threshold, we derived the Wannier exponent alpha for the double-photoionization cross section sigma2+propto Ealpha (with E as the excess energy). Reasonable agreement with previous experiments and theoretical predictions has been found.

Print publication: Issue 22 (28 November 1999)
Received 22 July 1999, in final form 30 September 1999

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