Multiple detector triple coincidence spectrometer for ({ital e},3{ital e}) electron impact double-ionization measurements
- Johns Hopkins University, Baltimore, Maryland 21218 (United States)
- University of Maryland, College Park, Maryland 20742 (United States)
An ({ital e},3{ital e}) spectrometer for the study of double ionization of magnesium by electron impact is described. With the spectrometer the angular and energy distributions of the ejected electrons can be measured over a range of incident-electron energies. The spectrometer incorporates two ejected-electron electrostatic energy analyzers and a tandem electrostatic analyzer for the scattered electrons. Up to eight detectors can be placed at the focal planes of each of the ejected analyzers. This increases the data rate by a factor of 64 over arrangements with two ejected-electron detectors. In order to reduce noise and establish the energy of the final state of the doubly charged residual magnesium ion, triple-coincidence electronics are used with a preprocessing circuit to reduce dead time. The first double-ionization study with the instrument was the ejection of a 2{ital p} inner valence electron by a 3.5 keV incident electron accompanied by the subsequent filling of the 2{ital p} hole and the emission of a 35 eV Auger electron. {copyright} {ital 1995} {ital American} {ital Institute} {ital of} {ital Physics}.
- OSTI ID:
- 165200
- Journal Information:
- Review of Scientific Instruments, Vol. 66, Issue 5; Other Information: PBD: May 1995
- Country of Publication:
- United States
- Language:
- English
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