Simchenko S. Non-equilibrium electrical and magnetoelectrical effects in the reactive atomic collisions on surfaces of solids

Object of research: chemomagnetoelectrical effect; chemovalve effect; generation of hot electrons in Schottky diodes. Purpose and tasks of the research: 1. Search for new gas-solids systems in which electron-hole pairs in reactive atomic collisions are effectively generated, including with the participation of molecules H2, O2, CO, and others. 2. Experimental study of electrical and magnetoelectric physical phenomena in a solid, which is the result of collective electron excitation of a solid in atomic collisions. 3. Obtaining qualitative and quantitative data on electronic and atomic-molecular processes on the surface of solids when interacting with the surface of atomic or molecular particles. 4. Determination of the emission of electron-hole pairs in reactive atomic collisions. Research methods: еxperimental study of both kinetics and stationary characteristics of the above-mentioned effects at varying sample temperatures (in the range of 243 - 600 K) and controlled conditions in the gas phase and on the surface. Scientific novelty of the results: 1. The generation of e-h pairs is detected due to the energy liberated in reactive atomic collisions involving the H atoms on a number of solids: InP, Se, SiC, CdTe, Si. The generation of "hot" e-h pairs in metals is also investigated: Pd and Pt. 2. For the first time, nonequilibrium chemoeffects on the surface of a number of solids were observed using reactive-active mixtures of gases H2 + O2, CO + O2. 3. Measured basic physical characteristics of the observed electronic chemoeffects, namely the initial stages of kinetics, the dependence of stationary values of effects on temperature, partial pressure of atoms or pressure and the composition of reactive mixtures. 4. Electrophysical manifestations of nonlinear dynamics were detected in the course of the chemical reaction of hydrogen oxidation with oxygen to water on palladium films, which are part of the Schottky diode. 5. Proposed kinetic models of processes on the surface of the investigated solids and defined the stages of atomic processes leading to the electron excitation of a solid by interaction with atomic hydrogen. The estimation of energy parameters of stages is given. Numerical estimates of the output of e-h pairs are calculated for one reactionary atomic collision. The practical value of the results obtained: physical studies were carried out to evaluate the possibility of building fuel cells, whose work is based on fundamentally new approaches; specific systems "atomic particle - solid" are proposed and studied, which can be recommended for further development; investigated nonequilibrium physical effects serve as a source of information on the solid state surface and energy exchange and energy dissipation processes in the interaction of a gas particle - a solid.