Chemisorption of Nitrogen on Molybdenum

Abstract

Chemisorption studies have been made in a closed system by a mass spectrometer operated statically. Nature of molybdenum surface was changed in a short duration. The total saturation coverage is 1.2 5 ×10 14 molecules/cm 2 and is nearly equal to that for tungsten. A weekly bound adsorption state corresponding to the α-state of tungsten does not exist for molybdenum. Chemisorption states of two types are found; ζ is 35% of the total saturation coverage and is a dissociative chemisorption of which the heat of chemisorption is 2.7 5 eV. and ε is 65% and a non-dissociative chemisorption of 3.1 eV. The average sticking probability is 0.2 at low coverages. Generally, behaviours of molybdenum for nitrogen chemisorption are very resemble to that in the case of tungsten.