Issues »  Volume 42, Issue 4

Plasmon Spectroscopy of W (100) Single Crystal Surface

M. O. Vasylyev$^{1}$, E. G. Len$^{1,2}$, V. M. Kolesnik$^{1}$, I. M. Makeeva$^{1}$, V. I. Patoka$^{1}$, S. V. Smolnik$^{1}$

$^{1}$G. V. Kurdyumov Institute for Metal Physics, NAS of Ukraine, 36 Academician Vernadsky Blvd., UA-03142 Kyiv, Ukraine
$^{2}$Kyiv Academic University, N.A.S. and M.E.S. of Ukraine, 36 Academician Vernadsky Blvd., UA-03142 Kyiv, Ukraine

Received: 01.10.2019; final version - 15.01.2020. Download: PDF

Plasmon spectroscopy is used to study the electronic state near the W single crystal surface parallel to (100) crystallographic plane after various types of thermochemical and ion treatments. The study of the atomically pure faces of the metal single crystals under ultrahigh vacuum allows increasing the reliability of experimental data and comparing it with existing theoretical models developed for ideal crystals with the free surface. The average values of the surface ($E_s$) and bulk ($E_b$) plasmons’ energies, their ratio $E_{b}/E_{s}$, concentrations of conduction electrons corresponding to these plasmons, relative changes in interplanar spacing, and also the electrons work function from the W (100) surface are determined in the initial state and after consecutive heating in temperature range of 500–1600°C, holding in pure atomic oxygen and Ar$^{+}$ ion bombardment. A substantial dependence of experimental values of plasmon excitation energy on a state of the sample surface and degree of their vicinity to the values calculated using classical theory of collective electron-plasma oscillations in a solid during thermochemical and ion treatments of sample are explained. The minimal (4.07 eV) and maximal (4.37 eV) values of the work function of electrons from the W (100) surface, determined by the types of its treatment and important for practical applications in thermionic energy converters, are obtained.

Key words: surface of W (100) single crystal, conduction electrons, characteristic losses of electron energy, plasmons, electron work function.

URL: http://mfint.imp.kiev.ua/en/abstract/v42/i04/0471.html

DOI: https://doi.org/10.15407/mfint.42.04.0471

PACS: 68.49.Jk, 68.49.Sf, 71.45.Gm, 73.20.Mf, 79.20.Hx, 79.20.Uv

Citation: M. O. Vasylyev, E. G. Len, V. M. Kolesnik, I. M. Makeeva, V. I. Patoka, and S. V. Smolnik, Plasmon Spectroscopy of W (100) Single Crystal Surface, Metallofiz. Noveishie Tekhnol., 42, No. 4: 471—485 (2020) (in Russian)

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