Low dimensional systems

Diffusion and field desorption of barium atoms from an inhomogeneous rhenium surface

D. P. Bernadskii, V. G. Pavlov

Ioffe Institute, St. Petersburg, Russia

Abstract: Using field desorption microscopy, it is shown that the nature of desorption by an electric field of adsorbed barium atoms on a quasi-spherical surface of a rhenium single crystal that is inhomogeneous in work function depends on the rate of diffusion of adsorbate atoms over the surface. In the absence of diffusion of barium atoms over the surface ($T$ = 300 K), a pulse character of desorption is observed. At rhenium temperature $T$ = 700 K migration equilibrium is established on the surface, at which the concentration of barium adatoms on the faces of a rhenium single crystal can be different. It has been shown that in this case, a stationary field desorption mode is realized, in which the emission of barium ions comes from faces with higher work function.

Keywords: field desorption, microscopy, diffusion, work function, rhenium, barium.

Received: 23.05.2023
Revised: 23.05.2023
Accepted: 13.06.2023

DOI: 10.21883/FTT.2023.08.56162.87

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