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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Veröffentlicht in:	Journal of low temperature physics 2010, Vol.158 (1-2), p.244-249
Hauptverfasser:	Rybalko, A., Rubets, S., Rudavskii, E., Tikhiy, V., Poluectov, Y., Golovashchenko, R., Derkach, V., Tarapov, S., Usatenko, O.
Format:	Artikel
Sprache:	eng
Schlagworte:	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
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Beschreibung
Zusammenfassung:	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.
ISSN:	0022-2291 1573-7357
DOI:	10.1007/s10909-009-0025-6