Potassium adsorption on the Si(100)(2 times 1) surface studied by Si and K core level photoemission and photoabsorption spectroscopy

Journal Article · Wed Jul 01 04:00:00 EDT 1992 · Journal of Vacuum Science and Technology, A (Vacuum, Surfaces and Films); (United States)

DOI:https://doi.org/10.1116/1.578011· OSTI ID:7038904

Ma, Y ^[1]; Rudolf, P; Chen, C T; Sette, F ^[2]

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1. Molecular Science Research Center, Pacific Northwest Labs, Richland, Washington 99352 (United States)
2. AT T Bell Labs, Murray Hill, New Jersey 07974 (United States)

The questions of K--Si bonding and the K adsorption site of the K/Si(100)(2{times}1) surface system are studied by Si and K 2{ital p} core level photoabsorption and photoemission spectroscopy as a function of K coverage and incident x-ray polarization. An unoccupied K 4{ital s} derived surface state is found in the K {ital L}-edge spectra that is coverage as well as polarization dependent. It is also found that the {pi}* state of the surface Si dimer is eliminated by the potassium adsorption, indicating that there is some degree of charge transfer from K to the substrate. The K--Si bond is thus characterized as of mixed covalent/ionic type. The polarization dependence suggests that the Si--K bond is inclined towards the surface plane.

• DOE Contract Number: AC02-76CH00016
• OSTI ID: 7038904
• Journal Information: Journal of Vacuum Science and Technology, A (Vacuum, Surfaces and Films); (United States), Journal Name: Journal of Vacuum Science and Technology, A (Vacuum, Surfaces and Films); (United States) Vol. 10:4; ISSN 0734-2101; ISSN JVTAD
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
665000 -- Physics of Condensed Matter-- (1992-)
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ABSORPTION
ADSORPTION
ALKALI METALS
ALLOYS
BORON ADDITIONS
BORON ALLOYS
CHEMICAL BONDS
DIMERS
ELECTROMAGNETIC RADIATION
ELEMENTS
EMISSION
IONIZING RADIATIONS
METALS
PHOTOEMISSION
POTASSIUM
RADIATIONS
SECONDARY EMISSION
SEMIMETALS
SILICON
SORPTION
SPECTRA
X RADIATION