Determination of the Kinetic Characteristics of the Thermal Desorption and Heterogeneous Reaction of Dissociation of Morphine Molecules on the Surface of Oxidized Tungsten
Аннотация
Under the same experimental conditions, the processes of adsorption and the heterogenous reaction of dissociation on the surface and thermal desorption of C17H19NO3 morphine molecules with m/z 285 amu on the surface of oxidized tungsten are studied by the nonstationary surface ionization, such as the voltage modulation and flux modulation methods. The experiments are carried out using a high-vacuum mass spectrometer, in which a “black chamber” is used, all walls of which are cooled with liquid nitrogen. The kinetic characteristics of the processes of thermal desorption and the heterogeneous reaction of the dissociation of molecules on the surface, such as the rate constant of thermal desorption in the ionic and neutral states K+ and K0, the corresponding activation energies of thermal desorption E+ and E0, the pre-exponential factors C and D, as well as the rate constant of the heterogeneous dissociation reaction K d and the activation energy of heterogeneous reaction of dissociation on the surface, exponential factors in the equation of continuity of the surface concentration for C9H7N+CH3 radicals with m/z 144 amu during the adsorption of morphine molecules on the surface of oxidized tungsten are determined.