Concentration dependence of the field desorbing Ba atoms from the (011) face of W

Journal Article · Fri Jun 01 04:00:00 EDT 1979 · Sov. Phys. - Solid State (Engl. Transl.); (United States)

OSTI ID:5763772

Vladimirov, G G; Kuchkarov, K O

The low-temperature dependence of the field desorbing Ba atoms on their concentration was determined. A calculation of the energy l/sub 0/ representing binding of the atoms to the substrate was calculated by means of an equation derived using a model of image forces put forward by V. K. Medvedev (Izv. Akad. Nauk SSSR Ser. Fiz. 33, 528 (1969)). This gave a dependence l/sub 0/(n) greatly different in its nature and in the value of the energy from the data obtained by the thermal desorption method. The discrepancy was explained by a model also based on the image forces but allowing for the possibility of partial screening of the metal electrons from the action of the Ba/sup 2 +/ ion core by the electrons remaining in the outer shell. This model gave a dependence l/sub 0/(n) in good agreement with the results obtained by the thermal desorption method right up to concentrations of n=2 x 10/sup 14/ cm/sup -2/. Moreover, it was found that in the thermodynamic cycle relating the ion and atom energy one should allow for the change in the thickness of a double adatom layer.

• Research Organization: Institute of Physics at the A. A. Zhdanov State University, Leningrad
• OSTI ID: 5763772
• Journal Information: Sov. Phys. - Solid State (Engl. Transl.); (United States), Journal Name: Sov. Phys. - Solid State (Engl. Transl.); (United States) Vol. 21:6; ISSN SPSSA
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360104* -- Metals & Alloys-- Physical Properties
ALKALINE EARTH METALS
ATOMIC IONS
BARIUM
BARIUM IONS
BINDING ENERGY
CHARGED PARTICLES
DESORPTION
ELECTRIC FIELDS
ELEMENTS
ENERGY
IONS
METALS
REFRACTORY METALS
SORPTIVE PROPERTIES
SURFACE PROPERTIES
TRANSITION ELEMENTS
TUNGSTEN