Ultra-low Energy Electrons from Fast Heavy-ion Helium Collisions: The Target-cusp?

Abstract

In collisions of fast and highly charged ions with neutral atoms the ionization of the target atom is one of the most probable reactions. Therefore the energy and angular distributions of the emitted electrons have been investigated for more than three decades. But up to now there are no reliable experimental techniques for measuring electrons with energies below Ee ≤ 100 meV. Over the last years we have developed a new kind of electron momentum analyser which overcomes the restrictions of the conventional electron spectrometers in the low energy regime. In combination of this novel electron spectrometer with a high resolution recoil ion momentum spectrometer we have performed a kinematically complete experiment investigating the single ionization of Helium by 3.6 MeV/u Au53+ ions. The longitudinal momentum distribution of the low energy electrons is strongly asymmetric in the forward-backward direction due to the interaction with the long reaching coulomb potential of the outgoing highly charged projectile ion. For the ultra-low energy electrons the momentum distribution shows a sharp maximum at pe = 0.

Department(s)

Physics

International Standard Serial Number (ISSN)

0281-1847

Document Type

Article - Journal

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 2024 IOP Publishing, All rights reserved.

Publication Date

01 Dec 1999

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