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Observation of surface phonons in inelastic scattering of He atoms from LiF(001) crystal surfaces

Journal Article · · Phys. Rev. Lett.; (United States)

Preliminary results are reported on the inelastic scattering of low-energy (20 meV), monoenergetic (..delta..v/v=0.8% full width at half maximum) He nozzle beams from a LiF(001) surface along the <100> direction. The time-of-flight spectra reveal both broad and extremely sharp maxima. The broad maxima are attributed to a distribution of phonons of bulklike character with small momenta, while the sharp maxima indicate excitation of single discrete surface modes.

Research Organization:
Max-Planck-Institut fuer Stroemungsforschung, F-3400 Goettingen, Federal Republic of Germany
OSTI ID:
5239254
Journal Information:
Phys. Rev. Lett.; (United States), Journal Name: Phys. Rev. Lett.; (United States) Vol. 44:21; ISSN PRLTA
Country of Publication:
United States
Language:
English