The Study Of Trimethylamine's Photodissociation Mass Spectra

Amine substances are very important substances which can be found everywhere in organic compounds and life compounds. They are widely used in many kinds of biosynthesis and play a significant role in the fields of surface physical chemistry, environment, and atmosphere model and so on. Amine substances are closely bound up with our life, therefore, the study on which is of practical significance. The dissertation systematically explored some kinds of fatty amine's resonance enhanced multiphotons ionization and dissociation,such as methylamine, ethylamine, diethylamide, n-Propylamine, trimethylamine, and analyzed their ionization and the law of dissociation dynamic as well as fracture, and optimized and calculated the individual ions by means of Gaussion 98 ab initio calculations.The contents of the dissertation are as follows:First, Expatiated on the significances of the study and introduced the principles of the experiments including resonance enhanced multiphotons ionization and time-of-flight mass spectrometry as well as the experiment equipments including laser and time of flight mass spectrometer.Second, aimed at the ionization and dissociation mass spectrum of trimethylamine. Explained and analyzed the dissociation dynamics of trimethylamine in detail, and also analyzed the form structure of m/z=42 ion by means of ab initio calculation,and got that the ions which equal to m/z=42 is CH₃NCH⁺.Third, the study on the ionization and dissociation mass spectrum's commonness and characteristic of five kinds of simple alphatic amine, and analyzed the law of their fracture specifically,and got the conclusion that the uppermost fragmentation of simple alphatic amine was a fragmentation manner.Finally, compared the ionization and dissociation mass spectrum oftrimethylamine with that of n_propylamine which is the isomer of trimethylamine, and explained the reason of the differences in detail.