𝔖 Bobbio Scriptorium
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Frequency analysis of phonons backscattered from interfaces between solids and helium

✍ Scribed by W. Dietsche; H. Kinder

Book ID
104627278
Publisher
Springer US
Year
1976
Tongue
English
Weight
580 KB
Volume
23
Category
Article
ISSN
0022-2291

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✦ Synopsis

Monochromatic phonons were generated using superconducting tunneling junctions. These phonons were scattered at a solid surface. The backscattered phonons were detected by two different methods. A tunneling junction was used as a detector with a frequency threshold corresponding to its .energy gap and a bolometer was used as a detector which is sensitive to all phonons regardless of frequency. When the scattering surface was exposed to helium gas or bulk liquid the two detector signals changed differently. This qualitative frequency analysis yields evidence for frequency conversion of phonons in the two atomic layers of helium at the surface.

πŸ“œ SIMILAR VOLUMES

Reflection of high-frequency acoustic ph
Reflection of high-frequency acoustic phonons from solid-liquid interfaces studied by picosecond ultrasonics
✍ G. Tas; C.J. Morath; H.J. Maris πŸ“‚ Article πŸ“… 1996 πŸ› Elsevier Science 🌐 English βš– 204 KB

We have studied the reflection of coherent acoustic phonons at frequencies up to 300 GHz from solid-liquid interfaces using a picosecond ultrasonic technique. We report measurements of the magnitude of the reflection coefficient between both a-Si3N4 and a-SiO2, and ethylene glycol for temperatures f