Microwave Spectroscopy of Condensed Helium at the Roton Frequency

Microwave Spectroscopy of Condensed Helium at the Roton Frequency

A spectral absorption line of electromagnetic radiation in the frequency range 40–200 GHz and at temperatures 1.4–2.75 K is measured in liquid helium. It is found that the narrow line of resonance absorption near the roton frequency does exist against a wide pedestal. The results obtained are compar...

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Bibliographic Details
Published in:Journal of low temperature physics Vol. 158; no. 1-2; pp. 244 - 249
Main Authors: Rybalko, A., Rubets, S., Rudavskii, E., Tikhiy, V., Poluectov, Y., Golovashchenko, R., Derkach, V., Tarapov, S., Usatenko, O.
Format: Journal Article
Language:English
Published: Boston Springer US 2010
Subjects:
Analogies
Characterization and Evaluation of Materials
Condensed Matter Physics
Frequency ranges
Liquid helium
Low temperature physics
Magnetic Materials
Magnetism
Microwave spectroscopy
Neutron scattering
Physics
Physics and Astronomy
Resonance absorption
Rotons
Disk resonator
Superfluid helium
67.10.Hk
67.30.eh
Roton line
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Summary:A spectral absorption line of electromagnetic radiation in the frequency range 40–200 GHz and at temperatures 1.4–2.75 K is measured in liquid helium. It is found that the narrow line of resonance absorption near the roton frequency does exist against a wide pedestal. The results obtained are compared with the data on the roton spectrum obtained in neutron scattering experiments. The possible reason for narrow absorption peak appearance is analyzed and the analogy between the observed phenomenon and Mössbauer effect is considered.
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ISSN:0022-2291
1573-7357
DOI:10.1007/s10909-009-0025-6