NASA Logo

NTRS

NTRS - NASA Technical Reports Server

Back to Results
Charge exchange of low-energy ions in thin carbon foilsIn order to calibrate a time-of-flight mass spectrometer which is to be flown in the solar wind, the charge exchange properties of low-energy ions in thin carbon foils have been investigated. Incident ions of He, C, N, O, Ne, and Ar with energies in the range 0.5-2 keV/nucleon have been used to measure charge-state distribution, residual energy, and angular distribution after transmission through thin (1-6 microgram/sq cm) carbon foils. Within such foils, an equilibrium between ionization and recombination of the projectile is rapidly established, and, consequently, the charge state of the emerging particle depends essentially on its residual velocity. A comparison of the charge exchange properties of Ne-22 with Ne-20 demonstrates that indeed the velocity (and not the energy) of the emerging particle determines its final charge. A comparison of properties of different elements provides an indication of an electron shell effect. Predictions for the energy loss of ions within the carbon foils made with the TRIM code are in good agreement with the experimental results presented in this paper.
Document ID
19900063833
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Buergi, Alfred
(Bern Univ. Bern, Switzerland)
Oetliker, Michael
(Bern Univ. Bern, Switzerland)
Bochsler, Peter
(Bern Univ. Bern, Switzerland)
Geiss, Johannes
(Bern, Universitaet Switzerland)
Coplan, Michael A.
(Maryland, University College Park, United States)
Date Acquired
August 14, 2013
Publication Date
September 15, 1990
Publication Information
Publication: Journal of Applied Physics
Volume: 68
ISSN: 0021-8979
Subject Category
Inorganic And Physical Chemistry
Accession Number
90A50888
Distribution Limits
Public
Copyright
Other

Available Downloads

There are no available downloads for this record.
No Preview Available