Hydrogen adsorption on Ru(001) studied by Scanning TunnelingMicroscopy

Journal Article · Fri Jan 18 04:00:00 EST 2008 · Surface Science

DOI:https://doi.org/10.1016/j.susc.2007.10.042· OSTI ID:929060

Tatarkhanov, Mous; Rose, Franck; Fomin, Evgeny; Ogletree, D Frank; Salmeron, Miquel

The adsorption of hydrogen on Ru(001) was studied by scanning tunneling microscopy at temperatures around 50 K. Hydrogen was found to adsorb dissociatively forming different ordered structures as a function of coverage. In order of increasing coverage {theta} in monolayers (ML) these were ({radical}3 x {radical}3)r30{sup o} at {theta} = 0.3 ML; (2 x 1) at {theta} = 0.50 ML, (2 x 2)-3H at {theta} = 0.75, and (1 x 1) at {theta} = 1.00. Some of these structures were observed to coexist at intermediate coverage values. Close to saturation of 1 ML, H-vacancies (unoccupied three fold fcc hollow Ru sites) were observed either as single entities or forming transient aggregations. These vacancies diffuse and aggregate to form active sites for the dissociative adsorption of hydrogen.

• Research Organization: Ernest Orlando Lawrence Berkeley NationalLaboratory, Berkeley, CA (US)
• Sponsoring Organization: USDOE Director. Office of Science. Basic EnergySciences
• DOE Contract Number: AC02-05CH11231
• OSTI ID: 929060
• Report Number(s): LBNL--63781; BnR: KC0203010
• Journal Information: Surface Science, Journal Name: Surface Science Vol. 602; ISSN SUSCAS; ISSN 0039-6028
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ADSORPTION
HYDROGEN
SATURATION
SCANNING TUNNELING MICROSCOPY
TRANSIENTS
VACANCIES