Observation of K Auger electrons and K X-rays from collisions of Ar{sup 17+} and Ar{sup 18+} with surfaces
Journal Article
·
· Bulletin of the American Physical Society
OSTI ID:281588
- Oak Ridge National Laboratory, TN (United States)
With the recently installed CAPRICE ECR ion source at the ORNL Multicharged Ion Research Facility, we now can produce sufficient Ar{sup 17+} and Ar{sup 18+} beam intensities to perform spectroscopic studies of these ions during interactions with surfaces. K X-ray spectra have been observed for both Ar{sup 17+} and Ar{sup 18+} normally incident on the Be window of a Si detector. Auger electron spectra have been measured for 283 keV Ar{sup 17+} incident on a Au(011) single crystal at 10-20 degrees. The Auger electron energy spectra show well resolved KLL and KLM Auger peaks at 2.7 keV and 3.0 keV, respectively. These observed peak energies are about 200 eV higher than those observed by Randall subsequent to K-shell excitation of a neutral Ar target by fast ions. This shift is consistent with the significant L-shell vacancy production accompanying the K-shell excitation in this case, which is expected to be absent at these lower energies investigated in the present measurements Efforts are currently in progress to measure the corresponding Auger spectrum for Ar{sup 18+}.
- DOE Contract Number:
- AC05-84OR21400
- OSTI ID:
- 281588
- Report Number(s):
- CONF-9305421--
- Journal Information:
- Bulletin of the American Physical Society, Journal Name: Bulletin of the American Physical Society Journal Issue: 3 Vol. 38; ISSN BAPSA6; ISSN 0003-0503
- Country of Publication:
- United States
- Language:
- English
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