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Titolo:
Low-temperature adsorption microcalorimetry: Pb on MgO(100)
Autore:
Starr, DE; Campbell, CT;
Indirizzi:
Univ Washington, Dept Chem, Seattle, WA 98195 USA Univ Washington SeattleWA USA 98195 on, Dept Chem, Seattle, WA 98195 USA
Titolo Testata:
JOURNAL OF PHYSICAL CHEMISTRY B
fascicolo: 18, volume: 105, anno: 2001,
pagine: 3776 - 3782
SICI:
1520-6106(20010510)105:18<3776:LAMPOM>2.0.ZU;2-O
Fonte:
ISI
Lingua:
ENG
Soggetto:
SINGLE-CRYSTAL SURFACES; MGO FILMS; MO(100); DECOMPOSITION; CALORIMETRY; ENERGETICS; POTASSIUM; ETHYLENE; ADHESION; PT(111);
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
39
Recensione:
Indirizzi per estratti:
Indirizzo: Campbell, CT Univ Washington, Dept Chem, Seattle, WA 98195 USA Univ Washington Seattle WA USA 98195 , Seattle, WA 98195 USA
Citazione:
D.E. Starr e C.T. Campbell, "Low-temperature adsorption microcalorimetry: Pb on MgO(100)", J PHYS CH B, 105(18), 2001, pp. 3776-3782

Abstract

The heat of adsorption of Pb on an MgO(100) thin film at 190 K is measuredcalorimetrically as a function of coverage using a removable pyroelectric polymer ribbon as the heat-detecting element. This is the first demonstration that this versatile method of heat detection can be used for single-crystal adsorption calorimetry at cryogenic conditions. The results are compared to earlier measurements at room temperature. Similar to room temperature,the initial heat of adsorption at 190 K is similar to 100 kJ/mol. However,the heat of adsorption grows much more slowly with coverage toward the bulk heat of sublimation, consistent with a larger Pb island density (and smaller, flatter islands) at low temperature. Measurement of the sticking probability for Pb onto the MgO(100) thin film at temperatures down to 167 K arealso consistent with this.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 02/04/20 alle ore 19:12:02