Isothermal ramped field-desorption of benzene from tungsten

Journal Article · Tue May 01 00:00:00 EDT 1979 · J. Vac. Sci. Technol.; (United States)

DOI:https://doi.org/10.1116/1.570103· OSTI ID:6200407

Panitz, J A

The binding of molecular benzene on clean (field-evaporated) tungsten surfaces at 78 K has been investigated as a function of electric field strength using a new ramped field-desorption technique. The resulting spectra, analogous to total pressure thermal desorption spectra (which do not mass analyze the desorbing species), show a physisorbed structure below 0.36 V/A which increases continuously in area with increasing benzene coverage, a peak at 0.36 V/A which grows until a saturation coverage is reached (and is thought to represent a physically adsorbed transition layer between chemisorbed and multiple layer physisorbed benzene at the surface), and a series of poorly resolved chemisorbed peaks (between approx. =0.38 and 1.13 V/A) whose detailed shape depends on the local morphology of the surface region being examined. By recording the image of the desorbing species over the narrow field ranges which define these distinct features, the crystallographic behavior of the physisorbed and chemisorbed layers on the surface has been visually determined with angstrom resolution.

• Research Organization: Sandia Laboratories, Albuquerque, New Mexico 87185
• OSTI ID: 6200407
• Journal Information: J. Vac. Sci. Technol.; (United States), Vol. 16:3
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
BENZENE
BINDING ENERGY
DESORPTION
DISSOCIATION
TUNGSTEN
MORPHOLOGY
CHEMISORPTION
ELECTRIC FIELDS
ION MICROSCOPY
LOW TEMPERATURE
PHYSICAL PROPERTIES
ULTRAHIGH VACUUM
AROMATICS
CHEMICAL REACTIONS
ELEMENTS
ENERGY
HYDROCARBONS
METALS
MICROSCOPY
ORGANIC COMPOUNDS
REFRACTORY METALS
SEPARATION PROCESSES
SORPTION
TRANSITION ELEMENTS
360104* - Metals & Alloys- Physical Properties