Thermal properties of xenon adsorbed on graphite

✍ Scribed by E. De Rouffignac; G.P. Alldredge; F.W. Dewette

• Publisher: Elsevier Science
• Year: 1980
• Tongue: English
• Weight: 290 KB
• Volume: 69
• Category: Article
• ISSN: 0009-2614
• DOI: 10.1016/0009-2614(80)80006-6

✦ Synopsis

We report theoretical results for dynarmcal and thermodynamic properties of the bare graphlte (0001) surface. and with a physlsorbed monolayer of xenon. The surface vlbratlons of graphtte are less pronounced than those in more notroprc crystals The surface-elcess specific heat of the bare surface peaks at 45 K, that of the xenon at 13.5 K. In this letter we present some of the most stgmficant results obtamed so far m our calculatronal studtes of the surface dynamrcal and thermodynamrc propertres of graphtte, both with and wtthout an adsorbed monolayer of xenon [ I ] There IS, 0i course, quote general mterest m the properties of one of the most widely used substrates in adsorptton studies A more specrfic mterest derives from dncrepancres among measurements of the heat capacity of bulk graphrte and graphrtrzed carbon black of drffermg surface areas [Z-6] **, and from concurrent measurements [ I] of the heat capacity of graphrte with xenon adsorbed on It. Foliowmg the general approach of ref. [7], we have performed dynamical calculations on slabs of graphte conslstmg of finite numbers of atomic layers of (0001) onentatlon with stress-free top and bottom surfaces. * Research supported III part by the NSF under Grant No. DMR 7810309 and by the Robert A. Welch Foundation. ** We calculate the spectftc surface area of the graphttlzed lampblack as d all the area IS of a basal-plane character;