Abstract
Phonons backscattered from surfaces covered by thin helium films were found to be time delayed if detectors sensitive to thermal frequencies were used. With a sample geometry which excluded diffusive reflection we determined a quantitative measure of the delay.
Original language | English |
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Pages (from-to) | 202-204 |
Number of pages | 3 |
Journal | Physics Letters, Section A: General, Atomic and Solid State Physics |
Volume | 64 |
Issue number | 2 |
DOIs | |
State | Published - 12 Dec 1977 |