MEASUREMENT OF THE REACTION-RATE COEFFICIENTS OF REACTIONS OF H-2-2, D-2 N2 AND CH4 AT THERMAL-ENERGY( WITH NE, AR, KR, XE, H)

The reaction rate coefficients of the reactions of H-2+ (upsilon = 0, 1) ions with rare gas atoms Ne, Ar, Kr, Xe, and molecules H-2, D2, N2, O2 and CH4 at thermal energy have been measured in a Selected Ion Flo w Tube (SIFT) experiment, with He as a carrier gas at 298 K. The obtai ned reaction rate coefficients are close to the collisional rate coeff icients for most of the reactions studied. For the reaction of the H-2 + ions with Xe the reaction rate coefficient is a half of the collisio nal rate coefficient. Thermal reaction rate coefficients for the react ions of H+ with D2 and O2 are also reported.