Abstract

Investigations of plasma parameters in the H₂-negative glow are made in the pressure range 0.06–0.6 Torr. With the help of a plane and a cylindrical grid probe, which both were heated, group character of the velocity distribution of electrons is found. The electron temperature of the slow group is almost 600 °K. The density of the slow group shows that there must be strong volume-recombination in H₂. — With increasing pressure we find that the group character vanishes.