Enthalpies of adsorption of metal atoms on single-crystalline surfaces by microcalorimetry |
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| Affiliation: | 1. Interdisciplinary Research Center for Catalysis (ICAT), Department of Physics, Technical University of Denmark, DK-2800 Kgs. Lyngby, Denmark;2. Department of Chemistry, University of Washington, 98195-1700, Seattle WA, U.S.A.;1. Shanxi Datong University, Datong 037009, China;2. Taiyuan University of Technology, Taiyuan 030024, China;3. Datong Coal Mine Group Co., LTD, Datong 037003, China;1. Rzhanov Institute of Semiconductor Physics, 630090 Novosibirsk, Russia;2. Novosibirsk State University, 630090 Novosibirsk, Russia |
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| Abstract: | The heats of adsorption of metal gas atoms onto single crystalline surfaces can be measured directly as a detailed function of coverage using a unique microcalorimeter. The development of this experimental apparatus and the results obtained from these experiments will be reviewed. The heat detection is performed with a highly sensitive pyroelectric polymer ribbon pressed into contact with the thin (1 μ m thick) single crystal sample, onto which pulses of a metal atom beam impinge. Heats of adsorption have been measured for pulses of gas containing a few per cent of a monolayer with a pulse-to-pulse standard deviation as low as 1.5 kJ · mol − 1. The adhesion energy of multilayer metal films can be estimated from the integral enthalpy of adsorption. |
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