Abstract
A new crossed-beam experimental apparatus for the study of collisional ionization is described. Mass, angular and energy distributions of both positively and negatively charged ionic products may be obtained. A novel feature is the possibility of simultaneous mass and energy analysis by a time-of-flight technique applied to the electrostatic energy analyzer. Details of the fast neutral beam energy calibration are given and the capabilities of the apparatus are illustrated by new results for collisional ionization of fast Cs atoms by D 2O. Two small subsidiary peaks in the Cs + beam emitted by the alkali source are ascribed to single and double energy losses involving 6 s → 6 p excitation of neutral Cs atoms by fast Cs + within the charge exchange cell. The cross-section for this process at a Cs + laboratory kinetic energy of 100 eV is of the order of 10 −16 cm 2.
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