Investigation of cryoemission characteristics during ethanol condensation

Abstract

Physics of cryocondensates growth and properties is one of the research areas in which scientists deal with real and often non-equilibrium states, which represent a purely scientific and practical interest. In this case, there is a very limited list of factors that determine the growth process and morphology (structure) of received and test substances.This primarily refers to the thermodynamic parameters of cryocondensation – gas phase pressure and substrate temperature. The substrate material and its morphology can play a part at the initial stage of phase formation in the study of epitaxial layers in real cryocrystals properties formation, which is caused by an interaction between the gas particles and the substrate material, i.e. the adsorption nature of the earliest layers of condensate. Experiments series of detailed study of the cryoemission phenomenon, which was detected during the condensation of nitrous oxide and ethanol onto a cold substrate was carried out.The uniqueness of this phenomenon implies the fact that at the current time there is no theoretical determination of this radiation origin. The study of this phenomenon has revealed a number of characteristics that are related to both the thermodynamic parameters of the condensation and the actual radiation. Ethanol accompanied by radiation, when the substrate temperature is T = 16 – 60 K. On the other hand, when the condensing pressure is above 10-3Torr, radiation intensity increases. Furthermore, an optimal value of the gas phase pressure, in which the radiation intensity is maximum, exists for each of the condensation temperature in the range of 16-130 K. The main objectives of these studies are checking of a wider range of substances for their ability to cryocondensation radiation; study of the nature of radiation and its relaxation characteristics; study of thermally stimulated processes in condensed samples.