A mechanism is proposed for the decomposition of molecular clusters of diethylamine (C2H5)2NH on the surface of the NaAux intermetallic compound with the formation of decomposition products desorbed from the surface, including in the form of ions with m/z from 58 to 197, during heating of the intermetallic compound at a rate of 20 K/s. Exposure of the NaAux surface at a temperature of 320 K in diethylamine vapor leads to the formation of molecular clusters on it. Rapid heating of NaAux at a rate of 20 K/s leads to the decay of clusters, desorption, and ionization of the decay products due to the redistribution of internal energy over the degrees of freedom of the cluster. The study of thermal ionization processes during heating of NaAux at a rate of 20 K/s in the temperature range from 600 to 1000 K made it possible to establish that the surface stoichiometry during heating is quasi-stationary, dehydrogenation and ionization of individual diethylamine molecules occur under equilibrium conditions, while for compounds formed in the process of cluster decay, the conditions are not equilibrium. Keywords: thermal ionization, diethylamine, intermetallics, sodium, gold.
In a high-vacuum diode, the volt-ampere characteristic of the thermionic emission of Na+ with surface of NaxAu intermetallide. Its hysteresis was found, which is associated with changes in the surface NaxAu caused by the action of an external electric field. In accordance with the Schottky effect, analysis of the current-voltage characteristic and the value of the work function of the NaxAu surface was estimated. Suggested mechanism of thermionic emission of Na+ from the surface of NaxAu. Keywords: intermetallic compound, thermal ionization, Schottky effect.
Thermal ionization of methenamine (C6H12N4) on the surface of the NaAux intermetallic compound has been studied. It has been established thatthe processes of decomposition, desorption and ionization of adsorbedcompounds, thermally stimulated on the surface, proceed due to theaccumulation of energy at the degrees of freedom of the adsorption complex,including the adsorbed compound and a solid, by the mechanism ofmonomolecular decomposition reactions. In this case, the decomposition ofthe adsorption complex is accompanied by the desorption of ions that are notin thermal equilibrium with the solid. The uniformity of the temperaturedependences of the ion current and their distribution over two groupsallowed us to conclude that ions are desorbed from the surface, whichcorrespond to the decays of individual adsorbed molecules, as well as thedecays of dimers formed on the surface. The decay of methenamine moleculesduring thermal ionization occurs in the same way as their decay in vacuumduring electron ionization, which indicates the preservation of the bulkstructure of methenamine molecules during adsorption and a significantlifetime of the excited state of compounds on NaAux. Keywords: thermal ionization, methenamine, intermetallic compound, NaAux.\
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