Scattering of He atoms from KCN(001): Analysis of the energy exchange
- Department of Physics and Astronomy, Clemson University, Clemson, South Carolina 29634 (United States)
- Departments of Physics and Chemistry and Center for Materials Research Technology, Florida State University, Tallahassee, Florida 32306 (United States)
High-resolution inelastic He-atom surface scattering experiments have been carried out on an {ital in} {ital situ} cleaved KCN(001) molecular crystal surface in the temperature range of 40{lt}{ital T}{lt}334 K covering the temperature range of the two known bulk phase transitions at 168 and 83 K. No Bragg diffraction peaks other than the specular beam are observed over the entire temperature range. The scattering intensity is primarily composed of inelastic multiphonon processes along with some diffuse elastic-scattering contributions, the latter of which increases in magnitude with decreasing temperature while the former decreases in intensity with decreasing temperature. A theoretical model developed for explaining the multiphonon-scattering process gives very good quantitative agreement with the data.
- DOE Contract Number:
- FG05-85ER45208
- OSTI ID:
- 132463
- Journal Information:
- Physical Review, B: Condensed Matter, Journal Name: Physical Review, B: Condensed Matter Journal Issue: 19 Vol. 52; ISSN 0163-1829; ISSN PRBMDO
- Country of Publication:
- United States
- Language:
- English
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