Abstract
AbstractWith the ultimate goal of modifying the surface chemistry of zirconium, we present a temperature‐programmed desorption (TPD) study of ammonia adsorbed on Zr(0001) followed by soft electron bombardment. The TPD data indicate that water accompanies the thermal desorption of ammonia near 730 K, which is a result of the mixing of oxygen atoms from the subsurface region with ammonia dissociation products. Nitrogen is left at the surface following TPD and can be removed only by repeated sputtering cycles. These thermal effects occur with or without electronic excitation. Electron bombardment does, however, result in the desorption of hydrogen gas in TPD near 310 K, indicating the formation of new hydrogenic species at the surface via electronic excitation. The electron‐induced cross‐sections for the production of these species are determined to be in the 1–5(×10−18) cm2 range. Copyright © 2002 John Wiley & Sons, Ltd.
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