Thermal accomodation coefficients by high speed vibration of solid samples: I. Method and apparatus

A method and apparatus to determine thermal accommodation coefficients are described in which solid samples are vibrated at high velocity in the presence of a test gas at low pressure. Energy transfer between the incident gas molecules and the moving surface causes an increase in the solid temperature which is related to, and approximately proportional directly to the thermal accommodation coefficient and inversely to the emissivity. The apparatus may be used over a wide range of temperatures and pressures in the long mean-free-path region with many types and forms of solid samples. Measurements as a function of pressure may yield information on internal energy accommodation, as well as translational accommodation, in favorable circumstances. Results at room temperature for O₂, N₂, and Ar on uncoated and greased Pt, Ni, and Cu surfaces, and on carbon coated Pt are presented.     

Ein Kriterium für vollständige Durchschnitte

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Influence of electric field on weak localization

The influence of an electric field on weak localization is investigated. The conductance of thin Au and Ag films is measured for different applied electric fields. The electronic temperature of the conduction electrons is directly measured by the magneto-conductance of the films. The electric field does not alter the conductance and discriminates between the theories by Altshuler et al. and Tsuzuki.     

Graphische Fehlerabsch?tzung bei n?herungsweiser pH-Wert-Berechnung einwertiger S?uren und Basen

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Graphs for the determination of errors in calculations of pH values of monovalent acids and bases