title: Oscillations due to two-electron exchange during He-Ne collisions
abstract: Ne (-)(1s(2)2s(2)2p(5)3s(2)) and He (-)(1s2s(2)) autodetachment peaks in electron spectra arising from He-Ne collisions at energies ranging from 350 eV to 6 keV have been measured. The areas of these two peaks are found to oscillate approximately in antiphase, with a constant wavelength, on a (velocity)(-1) scale. It is shown that this behavior can be explained by the "quasiresonance" situation for the separating particles in the channels Ne (-)-He (+) and He (-)-Ne (+). This explanation implies that the oscillations can be understood as being due to the simultaneous "hopping" of two electrons.
authors.affiliation: Debye Institute, Utrecht University, Princetonplein 5, 3584 CC Utrecht, The Netherlands.
authors.initials: WG
authors.lastname: Planje
authors.initials: WB
authors.lastname: Westerveld
authors.initials: A
authors.lastname: Niehaus