Adsorption of nitric oxide on tungsten

Abstract

The characterization of the W(100) surface adsorbing nitric oxide at room temperature has been conducted with the conventional LEED and AES technique. Nitric oxide on the W(100) has shown ordered (2 × 2) and (4 × 1) patterns at the exposure of ⋍0.8 L and ⋍ 1.6 L respectively without any heat treatment. The sequential heating of the fully NO-covered surface has revealed (2 × 2), (4 × 1) and (2 × 1) structures. In the AES, as the exposure was increased the nitrogen and oxygen peaks did not grow up at the same rate, the latter kept nearly constant over the exposure of about3 L. The surface potential of nitric oxide on W(100) was -1.52 ± 0.03 V by the retarding field method. © 1974 The Japan Society of Applied Physics.