Abstract
IT has often been assumed that metal films condensed at a low temperature (−183° or −195° C.) are stable after warming several times to around room temperature. The recent work of Klemperer and Stone1 and Rosenberg2 on evaporated nickel and cleaved germanium surfaces respectively suggests that physical changes occur at the surface during oxygen chemisorption. Harrison and Morrison3 have postulated that similar changes occur when sodium chloride surfaces, formed by evaporation, are kept in vacuo at room temperature. These physical changes result in a decrease in area of the respective surfaces, Klemperer, Stone and Rosenberg detecting the process by the physical adsorption of krypton, Harrison and Morrison deducing it from results obtained by an isotopic exchange technique.
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