Spectroscopic study of the absorption of C/sub 2/H/sub 4/ and C/sub 2/H/sub 2/ on a rare-earth single Crystal. 1. Metallic Gd(0001)

Technical Report · Thu Jan 01 04:00:00 EST 1987

OSTI ID:7123881

Simonson, R J; Wang, J R; Ceyer, S T

The adsorption of ethylene and acetylene on a rare-earth-metal surface, Gd(0001), was studied primarily by ultraviolet photoemission and Auger electron spectroscopies. Both species adsorb dissociatively on the clean Gd(0001) surface at 165 K to form adsorbed atomic carbon and hydrogen. At slightly higher coverages, carbon-hydrogen bond scission is no longer complete, resulting in a mixture of atomic carbon, CH, and CH/sub 2/. Sticking probabilities for both species are estimated to be in the range 0.2-0.4. Molecular adsorption occurs at 165 K after passivation of the Gd(0001) surface with adsorbed C and Hx species. As the substrate temperature is increased above 300 K, these molecularly adsorbed species dissociate rather than desorb. Gadolinium carbide is formed at higher temperatures.

• Research Organization: Massachusetts Inst. of Tech., Cambridge (USA). Research Lab. of Electronics
• OSTI ID: 7123881
• Report Number(s): AD-A-193948/7/XAB
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400102 -- Chemical & Spectral Procedures
656003* -- Condensed Matter Physics-- Interactions between Beams & Condensed Matter-- (1987-)
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ABSORPTION
ACETYLENE
ADSORPTION
ALKENES
ALKYNES
CARBIDES
CARBON COMPOUNDS
ELECTROMAGNETIC RADIATION
ELECTRON EMISSION
ELEMENTS
EMISSION
ETHYLENE
GADOLINIUM
GADOLINIUM CARBIDES
GADOLINIUM COMPOUNDS
HIGH TEMPERATURE
HYDROCARBONS
HYDROGEN
METALS
MOLECULES
NONMETALS
ORGANIC COMPOUNDS
PASSIVITY
PHOTOELECTRIC EMISSION
RADIATIONS
RARE EARTH COMPOUNDS
RARE EARTHS
SORPTION
SPECTROSCOPY
SUBSTRATES
SURFACES
ULTRAVIOLET RADIATION