Correlation of Emission Processes for Adsorbed Alkali Films on Metal Surfaces

Abstract

Articles you may be interested inElectronic states of monatomic layers of alkali and rare earth metals adsorbed on graphene surfaces Low Temp.An analytical model is described in which the time-averaged charge of adsorbed particles is a function of the energy of transition between atomic and ionic states, as in a thermally ionized gas. This relation is used to determine the dipole moment of the adsorbed layer, including the effect of depolarization by adjacent charges. An expre~sion is ob~ained which relates the emission properties to the temperature, degree of surface coverage, and ?aslc 'pr~pertle~ of the :ubst:ate and adsorbate. Through estimation of the atom adsorption energy, a relatIOnship IS obtamed whIch gIVes a good correlation of most available data for the emission properties of surfaces immersed in cesium vapor.

Effect of anionic constituents on the surface ionization of lithium salts

“…For unrestricted adsorption and no dissociation, all molecules striking the surface stick, and the Langmuir adsorption isotherm may be ·written as Z e = eA The results presented illustrate a The principal ionic masses observed by electron-impact ionization correspond to Li+ (6,7), LiC1+ (42,44), and Li2Cl+ Above 1500°K, flashing the filament before each current measurement had no detectable effect on the surface ionization current. The surface was therefore clean.…”

Electrical and Magnetic Properties of Compositions in the Tantalum-Carbon System

“…effect and which are discussed below III connectIOn with the results obtained. 4 , 5 The dependence of lattice parameter, 6 melting point,7 mechanical proper.ti~s, 4 transition to superconductivity, 8 and spectral emiSSIV-ity9 on the metal-to-carbon ratio in TaC has also recently been determined. The variation of these physical properties with composition can better serv.e as a means for a precise characterization of each matenal or ~ample than a chemical analysis.…”

High-temperature performance of an integral cesium reservoir in a thermionic converter

“…1 Cesium vapor in the interelectrode space of a thermionic converter reduces the negative space charge effect on the emitter surface and the work functions of the electrodes due to the adsorption of cesium atoms on their surfaces. 2 The dependence of the cesium vapor pressure p cs on the liquid reservoir temperature T, is given empirically as 1 p cs = [(2.45 x 10«)/vTjexp(-8910/r r ), Torr (f or T r in Kelvin. Because of the exponential dependence of the cesium pressure on the liquid reservoir temperature, a high degree of temperature control is necessary for the reservoir to maintain a constant cesium pressure.…”