Nonadditivity of convoy- and secondary-electron yields in the forward-electron emission from thin carbon foils under irradiation of fast carbon-cluster ions

Journal Article · Thu Jun 15 04:00:00 EDT 2006 · Physical Review. A

DOI:https://doi.org/10.1103/PHYSREVA.73.0· OSTI ID:20787419

Tomita, S; Yoda, S; Uchiyama, R; Kudo, H ^[1]; Ishii, S; Sasa, K ^[2]; Kaneko, T ^[3]

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1. Institute of Applied Physics, University of Tsukuba, Tsukuba, Ibaraki 305-0006 (Japan)
2. Tandem Accelerator Complex, University of Tsukuba, Tsukuba, Ibaraki 305-8577 (Japan)
3. Department of Applied Physics, Okayama University of Science, 1-1 Ridai-cho, Okayama 700-0005 (Japan)

We have measured energy spectra of secondary electrons produced by fast-carbon-cluster C{sub n}{sup +} (n=1-4) bombardment of thin carbon foils (3.2, 7.3, 11.9, and 20.3 {mu}g/cm{sup 2}). For clusters of identical velocity, the convoy-electron yield is enhanced with increasing cluster size n, while the yield of secondary electrons is reduced. The yield of convoy electrons normalized to the number of injected atoms increases proportionally with cluster size n. This proportionality suggests that there is only a weak vicinage effect on the number of primary electrons scattered by the projectile. The vicinage effect observed in low-energy secondary electrons must therefore arise from either transport or transmission through the surface.

• OSTI ID: 20787419
• Journal Information: Physical Review. A, Journal Name: Physical Review. A Journal Issue: 6 Vol. 73; ISSN 1050-2947; ISSN PLRAAN
• Country of Publication: United States
• Language: English

Related Subjects

74 ATOMIC AND MOLECULAR PHYSICS
ATOMIC CLUSTERS
ATOMS
CARBON
CATIONS
ELECTRON EMISSION
ELECTRONS
ENERGY SPECTRA
FOILS
ION PAIRS
ION-ATOM COLLISIONS
IRRADIATION
YIELDS