Abstract
The dynamics of CH+4 and CH+3 ion formation in collisions of Kr+ (2P3/2′1/2) with thermal CH4 has been investigated in a crossed beam experiment at a hyperthermal collision energy of 1.18 eV. The scattering data show that the CH+4 product is formed in a near-resonant exoergic process in which the most probable energy transferred to the target is practically equal to the recombination energy of the Kr+ projectile (resonant energy transfer); in addition a wide band of internal states of CH+4 up to ±0.6 eV is populated in inelastic and superelastic collisions. In contrast, the CH+3 product is formed in dissociative charge transfer, with about one-half of the yield due to nonresonant, endoergic collisions of Kr+ (2P3/2). The other half of the CH+3 product is found to originate in near-resonant exoergic collisions of Kr+ (2P1/2). An estimate is given of the distribution of the total energy deposited in methane by the above processes.
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