J. Phys. Colloques
Volume 48, Numéro C9, Décembre 1987X-Ray and Inner-Shell Processes
|Page(s)||C8-665 - C8-668|
J. Phys. Colloques 48 (1987) C8-665-C8-668
TWO ELECTRON, ONE PHOTON TRANSITION PROBABILITY IN Al FOLLOWLNG DOUBLE K-SHELL IONIZATION BY ELECTRON IMPACTA. KUMAR1, J. AUERHAMMER2, H. GENZ3 and A. RICHTER2
1 California State University, Long Beach, CA 90840, U.S.A.
2 Institut für Kernphysik, Technische Hochschule Darmstadt, D-6100 Darmstadt, F.R.G.
3 Institut für Kernphysik, Technische Hochschule Darmstadt, D-6100 Darmstadt, F.R.G.
The decay possibilities of atoms with two K-shell vacancies have been studied by bombarding a thin (465 µg/cm2) Al target with electrons of E0= 20 keV. Besides the more cornmon probability involving a sequential decay, that leads to a K-2+ K-1L-1 transition with the emission of a Kα hypersatellite X ray - called one-electron, one-photon transition (OEOP) -, we have also investigated the weak correlated two-electron, one-photon transition (TEOP) by spectroscopy of the emitted X rays using a high resolution crystal spectrometer. The two transitions were recorded with different crystals always relative to the intensity to the Kα line which originates from a single K-shell vacancy. The branching-ratio BR = TEOP/OEOP was found to be BR = (1. 2±0.74)10-3, which is in qualitative agreement with theoretical predictions and close to previous heavy-ion induced experiments.