The influence of preadsorbed K on the adsorption of PF[sub 3] on Ru(0001) studied by soft x-ray photoelectron spectroscopy

Journal Article · Fri Apr 01 04:00:00 EST 1994 · Journal of Chemical Physics; (United States)

DOI:https://doi.org/10.1063/1.467195· OSTI ID:5183559

Chakarian, V; Shuh, D K; Yarmoff, J A ^[1]; Tao, H; Diebold, U; Maschhoff, B L; Madey, T E ^[2]; Shinn, N D ^[3]

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1. Department of Physics, University of California, Riverside, California 92521 (United States) Materials Sciences Division, Lawrence Berkeley Laboratory, Berkeley, California 94720 (United States)
2. Department of Physics and Astronomy and Laboratory for Surface Modification, Rutgers, The State University of New Jersey, Piscataway, New Jersey 08855 (United States)
3. Surface and Interface Science Department, Sandia National Laboratories, Albuquerque, New Mexico 87185 (United States)

Soft-x-ray photoelectron spectroscopy (SXPS) is utilized to study the coadsorption of K and PF[sub 3] on Ru(0001) at 90 and 300 K. In the absence of K, PF[sub 3] adsorbs molecularly at both temperatures. In the presence of a fractional monolayer of K, initially PF[sub 3] completely dissociates resulting in the formation of adsorbed KF and P species. As the surface is further exposed to PF[sub 3], some of the PF[sub 3] molecules adsorb via partial dissociation, resulting in the formation of PF and PF[sub 2]. This process continues until all the K has reacted. At 300 K, a fraction of the incoming PF[sub 3] molecules react with the adsorbed KF and form a species which is tentatively identified as KPF[sub 6]. The data show that surface chemistry is different at the two temperatures, as some of the chemical reaction channels occurring at 300 K are blocked at 90 K. The reduced surface mobility of the incident PF[sub 3] molecules at 90 K adversely affects the probability of PF[sub 3] and KF interactions, which, in turn, causes the concentration of adsorbed PF[sub 3] relative to P to be larger at lower temperatures.

• OSTI ID: 5183559
• Journal Information: Journal of Chemical Physics; (United States), Journal Name: Journal of Chemical Physics; (United States) Vol. 100:7; ISSN JCPSA6; ISSN 0021-9606
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
ADSORPTION
ALKALI METAL COMPOUNDS
ALKALI METALS
CHEMICAL REACTIONS
DISSOCIATION
ELECTROMAGNETIC RADIATION
ELECTRON SPECTROSCOPY
ELEMENTS
FLUORIDES
FLUORINE COMPOUNDS
HALIDES
HALOGEN COMPOUNDS
IONIZING RADIATIONS
METALS
NONMETALS
PHOSPHORUS
PHOSPHORUS COMPOUNDS
PHOSPHORUS FLUORIDES
PHOTOELECTRON SPECTROSCOPY
PLATINUM METALS
POTASSIUM
POTASSIUM COMPOUNDS
POTASSIUM FLUORIDES
RADIATIONS
RUTHENIUM
SOFT X RADIATION
SORPTION
SPECTROSCOPY
TEMPERATURE RANGE
TEMPERATURE RANGE 0065-0273 K
TEMPERATURE RANGE 0273-0400 K
TRANSITION ELEMENTS
X RADIATION