Charge exchange of low-energy ions in thin carbon foils

Journal Article · Sat Sep 15 04:00:00 EDT 1990 · Journal of Applied Physics; (USA)

DOI:https://doi.org/10.1063/1.346478· OSTI ID:6277034

Buergi, A; Oetliker, M; Bochsler, P; Geiss, J ^[1]; Coplan, M A ^[2]

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1. Physikalisches lnstitut, University of Bern, 3012 Bern (Switzerland)
2. Institute for Physical Science and Technology, University of Maryland, College Park, MD (USA)

In order to calibrate a time-of-flight mass spectrometer which is to be flown in the solar wind we have investigated the charge exchange properties of low-energy ions in thin carbon foils. We have used incident ions of He, C, N, O, Ne, and Ar with energies in the range 0.5--2 keV/nucleon to measure charge-state distribution, residual energy, and angular distribution after transmission through thin (1--6 {mu}g/cm{sup 2} ) 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 {sup 22} Ne with {sup 2}{sup 0}Ne demonstrates that indeed the velocity (and not the energy) of the emerging particle determines its final charge. Comparing properties of different elements one observes an indication of an electron shell effect. Predictions for the energy loss of ions within the carbon foils made with the TRIM code (J. F. Ziegler, computer code TRIM-88 (IBM-Research, Yorktown, NY, 1987)) are in good agreement with the experimental results presented in this paper.

• OSTI ID: 6277034
• Journal Information: Journal of Applied Physics; (USA), Journal Name: Journal of Applied Physics; (USA) Vol. 68:6; ISSN 0021-8979; ISSN JAPIA
• Country of Publication: United States
• Language: English

Related Subjects

656003* -- Condensed Matter Physics-- Interactions between Beams & Condensed Matter-- (1987-)
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ARGON IONS
CARBON
CARBON IONS
CHARGE EXCHANGE
CHARGED PARTICLES
COLLISIONS
ELEMENTS
ENERGY LOSSES
FOILS
HELIUM IONS
ION COLLISIONS
IONIZATION
IONS
LOSSES
NEON IONS
NITROGEN IONS
NONMETALS
OXYGEN IONS
RECOMBINATION
VELOCITY