Abstract
It is well established that the electron impact ionisation should converge towards the photon impact case in the limit of infinite incident energy and vanishingly small momentum transfer. Recent (e,3e) experiments on helium at high impact energy are re-analysed in this sense, together with new ones at intermediate energy. Surprisingly large deviations from the corresponding photo double ionisation ones are evidentiated. One of the most significant results of this analysis is that it is shown that the optical limit is reached differently for different escape angles of the emitted electrons while the momentum transfer vector is being fixed.
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Lahmam-Bennani, A., Duguet, A., Taouil, I., Gaboriaud, M.N. (2001). Is the Optical Limit Approached in Coplanar (e,3e) Experiments on He at High and Intermediate Energies?. In: Berakdar, J., Kirschner, J. (eds) Many-Particle Spectroscopy of Atoms, Molecules, Clusters, and Surfaces. Springer, Boston, MA. https://doi.org/10.1007/978-1-4615-1311-7_20
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DOI: https://doi.org/10.1007/978-1-4615-1311-7_20
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