| Electron-molecule collision is always one of the main subjects in atomic, molecular, and chemical physics. Dissociative electron attachment (DEA) occurs in the low-energy collision of electron and molecule. In the DEA process, temporary negative ion (AB-) spontaneously decays through the dissociation to A and B-fragments. The details about the DEA dynamics can be achieved by measurements of the momentum distribution of the anionic fragment B-. This thesis is composed of the following parts:In the first chapter, we introduce the background and theories of low energy electron-molecule collisions, then several experimental methods applied in the DEA study.Secondly, we present the details about our anion velocity map imaging apparatus. Then, we designed a homogeneous magnetic field using a pair of Helmholtz coils. They will be used in our new apparatus.Thirdly, in the third chapter, the fundamental theory and applications of the supersonic molecular beam are given. We carries out the mechanical design of the supersonic molecular beam which would be used in our new apparatus.In the last chapter, we developed the mass spectrometry technique by using the ion detector consisted of MCPs plus phosphor screen. Then, the DEA dynamics of1,2-dichlorobenzene was investigated by recording anion production efficiency curve and imaging momentum distributions of Cl-... |
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