Ammonia adsorption and decomposition on several faces of platinum

Autor:	J. M. Gohndrone, C. W. Olsen, T. R. Gow, Arthur L. Backman, Richard I. Masel, E. Yagasaki
Rok vydání:	1989
Předmět:	Thermal desorption spectroscopy Analytical chemistry chemistry.chemical_element Surfaces and Interfaces Condensed Matter Physics Decomposition Surfaces Coatings and Films Ammonia chemistry.chemical_compound Adsorption chemistry Chemisorption Sticking probability Spectroscopy Platinum
Zdroj:	Journal of Vacuum Science & Technology A: Vacuum, Surfaces, and Films. 7:1986-1990
ISSN:	1520-8559 0734-2101
DOI:	10.1116/1.575998
Popis:	This paper is part of an ongoing study of the structure sensitivity of ammonia adsorption on platinum. In the work here, the adsorption of ammonia on Pt(111) and Pt(210) are compared using temperature programmed desorption (TPD), single‐reflection infrared (IR), electron energy‐loss spectroscopy (EELS), and molecular‐beam techniques. In addition, the adsorption of ammonia on Pt(111), (5×20)Pt(100), (2×1)Pt(110), Pt(210), and Pt(211) are compared with TPD. It is found that the TPD spectrum of ammonia is similar on Pt(111), Pt(100), Pt(110), Pt(210), and Pt(211). There was always a molecular peak between 310 and 370 K, another peak at 170 K, and a multilayer peak at 120 K. The sticking probability was found to vary by a factor of 10 from Pt(210) to Pt(111). However, the infrared spectrum of ammonia adsorbed on Pt(111) is virtually identical to the EELS of ammonia on Pt(210) after accounting for a difference in the sensitivity of IR and EELS. Analysis of the TPD data indicates that the surface concentration ...
Databáze:	OpenAIRE
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