Complete momentum balance for single ionization of helium by fast ion impact: I. Experiment

Abstract

The collision dynamics of He single ionization by 3.6 MeV/u Se"2"8"+ impact was explored using the GSI-reaction microscope, a high resolution integrated multi electron - recoil-ion momentum spectrometer. The complete three particle final state momentum distribution (9 cartesian components p_i) was imaged with a resolution of #DELTA#p_i #approx# #+-#0.1 a.u. by measuring the three momentum components of the emitted electron and the recoiling target-ion in coincidence. The projectile energy loss has been determined on a level of #DELTA#E_p/E_p #approx# 10"-"7 and projectile scattering angles as small as #DELTA##theta# #approx# 10"-"7rad became accessible. The experimental data which are compared with results of classical trajectory Monte-Carlo (CTMC) calculations reveal an unprecedented insight into the details of the electron emission and the collision dynamics for ionization of helium by fast heavy-ion impact. (orig.)Available from TIB Hannover: RO 801(97-12) / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekSIGLEDEGerman