Premium
Mass spectrometric studies of adsorption of silver on tungsten (110) surfaces
Author(s) -
Gerth G.,
Abelmann U.
Publication year - 1989
Publication title -
crystal research and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.377
H-Index - 64
eISSN - 1521-4079
pISSN - 0232-1300
DOI - 10.1002/crat.2170240108
Subject(s) - tungsten , adsorption , monolayer , desorption , chemistry , supersaturation , substrate (aquarium) , analytical chemistry (journal) , atom (system on chip) , binding energy , flux (metallurgy) , crystallography , chromatography , atomic physics , organic chemistry , biochemistry , oceanography , physics , computer science , embedded system , geology
The adsorption of silver on (110)tungsten was studied by a mass spectrometric molecular beam technique. The temporal behaviour of the flux of adatoms leaving the substrate was measured at fixed temperatures between 860 K and 1080 K for constant impinging rates over the range 0.2 · 10 13 to 9.0 · 10 13 cm −2 s −1 . For moderate supersaturation the growth mode changed from the layer‐by‐layer growth of three monolayers to the growth of three‐dimensional nuclei (Stranski‐Krastanov mechanism). At equal rates of impinging and desorption flux, the equilibrium adatom concentration was determined and a set of adsorption isotherms was thus derived. The shape of the experimental isotherms was found to be broadly similar to that of the theoretical Fowler‐Guggenheim isotherm for a localized adsorption model. The binding energy of an Ag atom to the substrate, the lateral binding energy of a pair of atoms, the coordination number, and the vibration frequency of the adatoms for all three monolayers were obtained by suitable fitting procedures.