Soft electrons and their correlation with the recoil-ions for single ionization of helium by fast, heavy-ion impact

Conference · Sat Dec 31 04:00:00 EST 1994

OSTI ID:199822

Moshammer, R; Ullrich, J; Mann, R ^[1]

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1. GSI, Darmstadt (Germany); and others

Helium single ionization by 3.6 MeV/u Ni{sup 24+} impact was explored in a kinematically complete experiment. Combining a high-resolution recoil-ion momentum spectrometer ({Delta}E{sub R{parallel}}{approximately}{plus_minus}12 {mu}eV) with a novel 4{pi} {open_quotes}soft-electron{close_quotes} (0 eV {le} E{sub e} {le} 50 eV) analyzer all 3 momentum components of both the emitted recoil ion and electron were recorded simultaneously. More than 90% of the soft electrons are ejected in forward direction in agreement with CTMC predictions. The backwards recoiling He{sup 1+}-ion compensates the electron momentum completely in the longitudinal (except of the Q-value) and partly in the transverse direction. Energy losses of the 208 MeV projectile as small as {Delta}E{sub p}/E{sub p} {approximately} 10{sup {minus}8} become detectable.

• OSTI ID: 199822
• Report Number(s): CONF-941129--
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
CORRELATIONS
ELECTRONS
HELIUM 4
ION-ATOM COLLISIONS
IONIZATION
MEV RANGE 100-1000
NICKEL IONS