Hydrogen-Atom and Charge Transfer Reactions within Acetylene/Methanol and Ethylene/Methanol Heteroclusters
Reactions that proceed within mixed acetylene-methanol and ethylene-methanol cluster ions were studied using an electron-impact time-of-flight mass spectrometer. When acetylene and methanol seeded in helium are expanded and ionized by electron impact, the ion abundance ratio, $[CH_3OH^+]/[CH_2OH^+]$ , shows a propensity to increase as the acetylene/methanol mixing ratio increases, indicating that the initially ionized acetylene ion transfers its charge to adjacent methanol molecules within the clusters. Investigations on the relative cluster ion intensity distributions of $[CH_3OH_2^+]/[CH_3OH^+]$ and $[(CH_3OH)_2H^+]/[CH_3OH \cdot CH_2OH^+]$ under various experimental conditions suggest that hydrogen-atom abstraction reaction of acetylene molecule with $CH_3OH$ ion is responsible for the effective formation of $CH_2OH$ ion. In ethylene/methanol clusters, the intensity ratio of $[CH_3OH_2]/[CH_3OH]$ increase linearly as the relative concentration of methanol decreases. The prominent ion intensities of $(CH_3OH)mH$ over $(CH_3OH)_m$ $_1CH_2OH$ ions (m = 1,2, and 3) at all mixing ratios are also interpreted as a consequence of hydrogen atom transfer reaction between $C_2H_4$ and $CH_3OH$ to produce the protonated methanol cluster ions.
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