Berlin 2001 – wissenschaftliches Programm
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A: Atomphysik
A 14: Ion Scattering II (with molecules and surfaces)
A 14.12: Vortrag
Donnerstag, 5. April 2001, 18:30–18:45, H1028
Relativistic electron transport through carbon foils — •Marek Seliger1, Károly Tőkési1, Carlos O. Reinhold2, and Joachim Burgdörfer1 — 1Institute for Theoretical Physics, Vienna University of Technology, Wiedner Hauptstr. 8-10, A-1040 Vienna, Austria — 2Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831-6377
Electron loss to continuum (ELC) by transmission of a relativistic highly charged ion (Ar17+) with an energy of 390 MeV/amu through carbon foils with thickness varying between 25 and 9190 µg/cm2 is studied. The calculation is based on the solution of the classical Langevin equation. The random walk of the relativistic electron initially bound to the argon nucleus is simulated by a Monte Carlo method. As a result of a series of stochastic elastic and inelastic collisions during transport, the projectile is excited or ionised. The simulated electron spectra at 0∘ (convoy electron spectra) are in good agreement with the recent experimental results [1]. The full width at half maximum (FWHM) is initially decreasing for increasing thickness as a result of higher probability for ELC from intermittently formed Rydberg states. For thicker targets the FWHM is increasing because of a longer random walk of electrons in the solid subsequent to ionisation leading to an enhanced collisional broadening of the spectrum. This work was supported by the Austrian Fonds zur Förderung der wissenschaftlichen Forschung (P12470-TPH).
[1] Y. Takabayashi et al., Abstract book of 21st ICPEAC (1999) 730.