Hydrogen bonding on iron: correlation of adsorption and desorption states on Fe(100) and perturbation of the FeH bond with coadsorbed CO
| Autor: | Robert J. Madix, Philip B. Merrill |
|---|---|
| Rok vydání: | 1996 |
| Předmět: |
Hydrogen
Hydrogen bond Thermal desorption spectroscopy Electron energy loss spectroscopy Inorganic chemistry Analytical chemistry Thermal desorption chemistry.chemical_element Surfaces and Interfaces Condensed Matter Physics Surfaces Coatings and Films Adsorption chemistry Chemisorption Desorption Materials Chemistry |
| Zdroj: | Surface Science. 347:249-264 |
| ISSN: | 0039-6028 |
| DOI: | 10.1016/0039-6028(95)01016-5 |
| Popis: | Electron energy loss vibrational spectra suggest that hydrogen first adsorbs on Fe(100) in four-fold hollows ( β 2 ) and converts to sites of lower ligancy ( β 1 ) with increasing coverage. The β 1 state desorbs with pseudo first-order kinetics with an activation ener of 14.1 kcal/mol. The β 2 state exhibits a vibrational frequency of 700 cm −1 , indicative of adsorption in four-fold hollows. With increasing coverage this mode is replaced by a vibration at 1000 cm −1 , indicative of conversion of adsorbed H to an asymmetric position within the four-fold hollow. Adsorption of CO onto the H-covered surface causes an increase in the frequency of the mode near 1000 cm −1 associated with movement to a position of lower ligancy within the four-fold hollow. |
| Databáze: | OpenAIRE |
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