Chemical behaviors of chemically activated ethylcholride and intracluster ion-molecule reactions of their some reaction products and polar molecules

Abstract

The Photolysis of ethylchloride at 121.6 nm was studied over the pressure range of 60-4000 Pa at room temperature using a hydrogen atom resonance lamp. Pressure effect was investigated with $CO_2$ and $SF_6$. A scavenger effect of the reaction was also observed by adding NO gas. The major products of the reaction were $CH_4$, $C_2H_2$ and $C_2H_4$. The branching ratio between the elimination process and the radical process was found to be 0. 68 to 0.32. The fraction of hot ethylene(above critical energy) was found to be ca. 30%. The intracluster ion-molecule reactions are studied using electron impact time-of-flight mass spectrometry. Homogeneous and Heterogeneous clusters are produced from supersonic expansion. Experiments are operated at different mixing ratios and different electron impact energy. The structural stabilities of clusters and the ion-molecule reactions were studied with solvation effects. Intensity distribution of $C_6H_6(NH_3)m^{+}$ ions shows a distinct magic number of m=4 which $C_6H_4^{+}$ ion represents benzyne ion. Intensity distributions of $(C_2H_2)_3(NH_3)m^{+}$ and $C_6H_4(NH_3)m^{+}$ ions show a clear magic number of m=2 which represents to be symmetric which one $NH_3$ molecule located on the $C_6$ axis on each side of the benzene ring. Investigations on the intensity distributions of $(C_2H_4)_n(NH_3)m^{+}$ ions suggest that $(C_2H_4)_2(NH_3)m^{+}$ and $(C_2H_4)_3(NH_3)m^{+}$ ions have the enhanced structural stabilities. The stable configurations of these ionic species have been proposed to have central species $(C_2H_4)_2^{+}$ and $(C_2H_4)_3^{+}$ which provide three and two hydrogen-bonding site, respectively. Intensity distribution of $C_2H_5(NH_3)m^{+}$ ions shows a magic number of m=4 which represents $C_2H_5NH_3^{+}$ formed from the ion-molecule reaction of $C_2H_5^{+}$ and $NH_3$. Investigation on the intensity distribution of $C_2H_3(H_2O)M^{+}$ ions and fragmentation suggest that protonated acetaldehyde ion($CH_3CH_2OH_2^...