Reflection of metastable helium atoms on a molybdenum /110/ surface effect of oxygen adsorption

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Abstract
This article presents the results of work concerned with the reflection of metastable helium atoms with thermal kinetic energy by a monocrystalline surface of molybdenum / 110/, as a function of angle of incidence and degree of oxygen coverage. Measurements were taken with a time of flight method. The reflection coefficient, very low with small angles of incidence, is greater with high angles, and increases with the rate of exposure to a controlled oxygen atmosphere. The form of the reflection lobes is also strongly influenced by these two parameters