Main field of study: 011200 Physics
Area of specialization: Physical Optics and Lasers
Department of Optics
Scientific advisor: prof. V.S. Soukhomlinov
Reviewer: prof. V.M. Nemetz

Emission of low impurities from a bulk sample in case of erosion
and chemical reactions
M.R. Pershin

A physical model and analytical theory has been developed for describing the dynamics of spatial distribution and flows of atoms from the surface of a bulk sample for the case if the atoms of both impurity and the basis are leaving the sample surface with taking into account surface movement and chemical reactions between absorbed gas and sample basis. Model valid for arbitrary time dependence of various processes constants, such as speed of chemical reaction, sample border movement speed and diffusion coefficient. Model also applicable for wide range of temperatures: not only when temperatures are relatively small and chemical reaction takes place upon the sample surface, but also for the height temperatures, when coefficient of diffusion is also huge and chemical reaction takes place deep in the sample.

The list of publications
1. M.R. Pershin, V.S. Soukhomlinov. Formation of impurity atoms distribution on depth taking into account movement of a sample border in the conditions of a simultaneous erosion and atom condensation on a surface // Vestnik of St. Petersburg State University, Volume 1 (59), Issue 3, 2014. P. 357-370.