Hydrogen on impurity-covered iron surfaces. [Difference in molecular and atomic H]
Thesis/Dissertation
·
OSTI ID:5772131
Hydrogen adsorption was studied on Fe(100) and Fe(100)-c(2 x 2)X with X being Si, C, S, and Sn-by means of AES, LEED, TDS, and Kelvin probe work function measurements. Fe(111)-p(1 x 1)Si, Fe(110)-c(7 x 1)Si, and Ni(100) were also investigated. On Fe(100), the presence of these impurities reduced the sticking probability, the desorption energy, the pre-exponential factor for desorption, and the saturation coverages. Different TDS features were observed if atomic hydrogen was presented to the surface. For C- and Si-covered surfaces, this behavior was attributed to formation of surface complexes. On S- and Sn-covered surfaces, atomic hydrogen adsorbed more readily than molecular hydrogen, but no complexes were formed.
- Research Organization:
- Pennsylvania State Univ., University Park (USA)
- OSTI ID:
- 5772131
- Country of Publication:
- United States
- Language:
- English
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