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Calculation of the Lifetime of Slow Positrons at Metal Surfaces
Author(s) -
Shrivastava S. B.,
Gupta V. K.
Publication year - 1993
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.2221750209
Subject(s) - positron , surface (topology) , trapping , diffusion , atomic physics , yield (engineering) , materials science , diffusion equation , metal , physics , nuclear physics , thermodynamics , electron , geometry , metallurgy , ecology , mathematics , economy , economics , biology , service (business)
The diffusion equation for positrons at metal surfaces is solved to give the rate of positrons reaching the surface. Rate equations are written to describe the various processes at the surface including the trapping of positrons in near‐surface defects. These are solved to yield the lifetime of positrons at surfaces as a function of temperature and for different incident energies. The calculated results show that the positron lifetime increases with the increase in temperature and decreases with the incident energy. The above results are compared with available experimental values.