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MECHANISM OF CHANGE IN THE EMISSION AND OPTICAL PROPERTIES OF W AND MO AFTER BOMBARDMENT WITH LOW-ENERGY IONS

Mechanical bonds, ion implantation, emission efficiency, Auger spectrum, quantum yield, plasma oscillations, Fermi level.

Authors

The paper reports the results of study of composition, emission, and optical properties of polycrystalline W and Mo samples
implanted with Ba+ ions and coated with submonolayer Ba atoms by applying Auger electron spectroscopy, secondary electron
emission coefficient  technique, as well as the photoelectron quantum yield Y. The experimental part was carried out by using
the instrumentation and under vacuum Р ≈ 10-6 Pa. It is shown that during the implantation of Ba ions in the surface layers of
refractory metals, a mechanical mixture of the W + Ba and Mo-Ba types is formed. It has been established that the values of
the coefficient of secondary electron emission  and the quantum yield of photoelectrons Y at the same value of the work
function еφ in the case of implantation of Ba+ ions are much larger than in the case of deposition of atoms. The obtained
experimental results are substantiated by theoretical calculations.

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