CHARGE-TRANSFER OF KRYPTON IONS WITH METHANE MOLECULES FROM THERMAL-ENERGY TO 10 EV

Total integral cross sections and product branching ratios for the rea ction of krypton ions with methane molecules are reported. Experimenta l data have been obtained through the use of both crossed molecular be ams and beam-cell techniques over a wide energy range (2 x 10(-2)-10 e V), Thresholds for the appearance of CH2+ product have been measured a nd found close to the expected thermodynamic values, A model for the d escription of the quasi-resonant charge-transfer process, which mainly dominates the collisional dynamics, is presented. This model accounts adequately for the observed similar to E(-1/3) energy dependence of t he total cross section and also reproduces to a good approximation the size of the total cross section.