Effect of hydrogen on the evaporation field of metals

M. Wada, Ryuji Uemori, O. Nishikawa

Research output: Contribution to journalArticle

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Abstract

Field ion images of Fe, Ni, Cu and Pd were observed in a Ne and a H2 atmosphere and the applied voltage at which the atomic planes of the specimen surface were field-evaporated at a contant rate was measured in a temperature range from 20 to 150 K. The voltage-temperature relation for Fe and Ni was almost linear in Ne and the field evaporation was discussed in terms of the charge exchange model. A large reduction of the evaporation voltage by adsorbed hydrogen was observed with these metals. This reduction was attributed to the decreased binding energy of surface atoms and the substrate by the chemisorbed H atoms. It was also observed that there were two distinct stages in the voltage-temperature relation with the transition temperature of about 85 K in hydrogen adsorbed Fe and Ni. Assuming the same evaporation mechanism in Ne and in H2, the decrease in the binding energy in these stages was estimated. A significant reduction of the evaporation voltage by hydrogen was also observed with Cu.

Original languageEnglish
Pages (from-to)17-29
Number of pages13
JournalSurface Science
Volume134
Issue number1
DOIs
Publication statusPublished - Nov 1 1983

Fingerprint

Hydrogen
Evaporation
Metals
evaporation
Electric potential
electric potential
hydrogen
metals
Binding energy
binding energy
Atoms
charge exchange
Temperature
Superconducting transition temperature
temperature
atoms
Ion exchange
transition temperature
Ions
atmospheres

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films
  • Materials Chemistry

Cite this

Effect of hydrogen on the evaporation field of metals. / Wada, M.; Uemori, Ryuji; Nishikawa, O.

In: Surface Science, Vol. 134, No. 1, 01.11.1983, p. 17-29.

Research output: Contribution to journalArticle

Wada, M. ; Uemori, Ryuji ; Nishikawa, O. / Effect of hydrogen on the evaporation field of metals. In: Surface Science. 1983 ; Vol. 134, No. 1. pp. 17-29.
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