Abstract
Thermal energy ion-molecule reactions of Ar+ with n-C4H10 and iso-C4H10 have been studied by using a low-energy beam apparatus. The total reaction rate constants were determined to be (7.9±2.8) × 10-10 and (8.6±3.1) × 10-10cm3s-1 for n-C4H10 and iso-C4H10, respectively. These values amount to about 60% of calculated values from Langevin theory. Major exit channels observed were C2H5+ (36%), C2H3+ (32%), and C3H5+ (22%) for n-C4H10, while C2H3+ (46%) and C3H5+ (42%) for iso-C4H10. The product ion distributions suggested that charge transfer occurs through near-resonant electron jump. The dissociative ionization processes were discussed from photoelectron spectroscopic data.
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