Open AccessАдсорбция натрия на поверхности термически окисленного вольфрама
Author(s) -
П.А. Дементьев,
Е.В. Дементьева,
М.Н. Лапушкин,
Д. А. Смирнов,
С.Н. Тимошнев
Publication year - 2022
Publication title -
fizika tverdogo tela
Language(s) - English
Resource type - Journals
eISSN - 1726-7498
pISSN - 0367-3294
DOI - 10.21883/ftt.2022.06.52402.294
Subject(s) - tungsten , x ray photoelectron spectroscopy , cathodoluminescence , valence (chemistry) , chemistry , luminescence , photoemission spectroscopy , oxide , analytical chemistry (journal) , oxygen , oxidation state , inorganic chemistry , materials science , metal , nuclear magnetic resonance , physics , optoelectronics , organic chemistry , chromatography
Photoelectron spectroscopy was used to study the electronic structure in situ in an ultrahigh vacuum before and after the adsorption of sodium atoms on the surface of tungsten oxidized at an oxygen pressure of 1 Torr and a temperature of 950 K. The photoemission spectra from the valence band and the W 4f, O 2s, and Na 2p core states were studied under synchrotron excitation in the photon energy range 80–600 eV. It is found that a tungsten oxide film is formed which contains various tungsten oxides with an oxidation state of 6+ to 4+. The deposition of a 1.1 monolayer of sodium atoms on the surface of oxidized tungsten leads to the reduction of the W6+ states to W4+ and the reaction with oxygen in the hydroxyl composition, which is reflected in the change in the spectrum of the W 4f and O 2s core states. It is shown that the cathodoluminescence spectrum is associated with the luminescence of tungsten oxide.