Ostroverkh A. Ionization of glucose, ascorbic acid, adenine, guanine and POPOP molecules by electron impact.

The thesis is devoted to the study of patterns and of features channel dissociation of complex molecules guanine, adenine, glucose, ascorbic acid and electroactive molecules POPOP using the modernized monopol mass spectrometer. Is developed and implemented a new source of ions. Studied the threshold the cross sections of ionization and dissociative ionization by electron impact of glucose and vitamin C, guanine, adenine and POPOP molecules in the energy range from threshold to 70 eV. A systematic mass spectrometric study are investigated in the ionization of molecules (mass range form 1 to 350 amu) provided the gap minimum number of connections, which lead to the apearance of ion fragments. The results of mass spectra were analyzed under different experimental conditions: different temperatures and energies of ionized electrons. The basic channels of molecular dissociation and studied. The dynamics of the formation of ion-fragments is studied in detail, the threshold behavior of ionization and dissociative ionization of these molecules are obtained. From the experimental data of energy dependence of cross sections ionization is determined the potentials of ionization of molecules and threshold energy appearance of ion fragments. The fundamental value of the results lies in the fact that a number of new molecular constants can be used in mass spectrometry of organic and inorganic compounds.