Heat capacity of {sup 4}He monolayers adsorbed on evaporated gold
- Lawrence Berkeley National Lab., CA (United States)
The specific heat of {sup 4}He condensed on an evaporated gold surface has been measured for coverages between 0.007 and 0.096 {angstrom}{sup {minus}2} and temperatures between 0.4 and 3.0 K. There are at least two types of physisorption site on the gold surface with binding energies {minus}83 {+-} 7 and {minus}94 {+-} 7 K. For coverages below 0.06 {angstrom}{sup {minus}2} ({approximately} 0.5 monolayers), the {sup 4}He is a two-dimensional classical gas at sufficiently high temperatures. At lower temperatures and higher coverages, the {sup 4}He forms condensed phases, including liquids, solids commensurate with the gold lattice, and incommensurate solids. The phase diagram of {sup 4}He/evaporated gold is similar to that for {sup 4}He/graphite, but the phase boundaries are shifted and not well defined, nor is the diagram as rich in structure.
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- AC03-76SF00098
- OSTI ID:
- 563600
- Journal Information:
- Journal of Low Temperature Physics, Vol. 109, Issue 1-2; Other Information: PBD: Oct 1997
- Country of Publication:
- United States
- Language:
- English
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