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Helium desorption from a tungsten single crystal
Author(s) -
Mhaskar S. P.,
Naik P. K.
Publication year - 1981
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.2221070109
Subject(s) - tungsten , helium , molybdenum , desorption , thermal desorption , crystal (programming language) , activation energy , single crystal , materials science , chemistry , atomic physics , crystallography , adsorption , physics , metallurgy , computer science , programming language
Entrapment of helium in molybdenum and tungsten has been investigated both theoretically and experimentally in detail in the past. In general, peaks observed in the thermal desorption spectra of helium are related to the detrapping reactions of helium from He n V ( n = 1 to 4) complexes. A computer programme is developed to simulate the activation energies of these detrapping reactions in the bulk of the solid and in the vicinity of the crystal surface. Experimental values of the activation energies of these reactions reported earlier by Kornelsen show good agreement with the values calculated for the same reactions occurring in the bulk. Values calculated for these reactions near the surface are much lower than the experimental values. It is further shown that an agreement between the experimental and the calculated values of activation energies for the surface reactions is possible only if the entrapment is made to occur near the surface.