Department of Physics and Astronomy: Publications and Other Research


Date of this Version

July 1988


Published in Phys. Rev. Lett. 61, 302 - 305 (1988) [Issue 3 – July 1988]. ©1988 The American Physical Society. Used by permission.


Classical-trajectory Monte Carlo calculations have been used to study ionizing collisions between charged particles (p, , ℯ+, ℯ-) and He atoms at an incident velocity of 2.83 a.u. While differences in the total single-ionization cross sections for these projectiles are small, our calculations reveal large effects at all angles in the ionized electron spectra, and provide qualitative evidence for a Barkas effect in p and collisions. Experimental data agree well with our fully classical calculations, including cross sections involving ejected electrons of long wavelength.

Included in

Physics Commons