ASSOCIATIVE IONIZATION IN COLLISIONS OF H-2(-2(+) AND H-(), D)

This paper reports on the measurement of the absolute cross sections o f the following associative ionization processes: H-2(+) + H- --> H-3( +) + e H-2(+) + D- --> H2D+ + e D-2(+) + H- + D2H+ + e D-2(+) + D- --> D-3(+) + e. Measurements were carried out using merged beams and chop ping the negative beam to evaluate the background. The measurements co ver the barycentric energy range from 0.07 to 10 eV. The four cross se ctions were, within experimental error, equal both in magnitude and en ergy dependence.