At frequencies above 150 GHz conventional microwave techniques become unsuitable for electron magnetic resonance (EMR) spectroscopy applications. Quasi-optical techniques are the general frame into which the different approaches to high-field high-frequency EMR (HF2-EMR) have been developed, Beyond the single-pass approach the existing HF2-EMR spectrometers make use of Fabry-Perot resonators. In this paper the use of an alternative resonating structure on the basis of the use of whispering gallery mode dielectric resonators is shown. The physics of these resonators and their implementation in a HF2-EMR probe head are described. Their use in HF2-EMR experiments performed on standard samples is described and the results of these experiments critically discussed in order to have insight into the open problems of the employed spectrometer; the more promising solutions to these problems, actually under development, are briefly outlined.

Whispering gallery mode dielectric resonators in EMR spectroscopy above 150 GHz: Problems and perspectives / Annino G; Cassettari M; Fittipaldi M; Lenci L; Longo I; Martinelli M; Massa CA; Pardi LA. - STAMPA. - 19:(2000), pp. 495-506. (Intervento presentato al convegno Conference on EPR, NMR and NQR in Solid State Physics - Recent Trends tenutosi a Università degli Studi di Pisa nel 14-18 June 1999).

Whispering gallery mode dielectric resonators in EMR spectroscopy above 150 GHz: Problems and perspectives

FITTIPALDI, MARIA;MARTINELLI, MANUELE;
2000

Abstract

At frequencies above 150 GHz conventional microwave techniques become unsuitable for electron magnetic resonance (EMR) spectroscopy applications. Quasi-optical techniques are the general frame into which the different approaches to high-field high-frequency EMR (HF2-EMR) have been developed, Beyond the single-pass approach the existing HF2-EMR spectrometers make use of Fabry-Perot resonators. In this paper the use of an alternative resonating structure on the basis of the use of whispering gallery mode dielectric resonators is shown. The physics of these resonators and their implementation in a HF2-EMR probe head are described. Their use in HF2-EMR experiments performed on standard samples is described and the results of these experiments critically discussed in order to have insight into the open problems of the employed spectrometer; the more promising solutions to these problems, actually under development, are briefly outlined.
2000
-
Conference on EPR, NMR and NQR in Solid State Physics - Recent Trends
Università degli Studi di Pisa
14-18 June 1999
Annino G; Cassettari M; Fittipaldi M; Lenci L; Longo I; Martinelli M; Massa CA; Pardi LA
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Utilizza questo identificatore per citare o creare un link a questa risorsa: https://hdl.handle.net/2158/891153
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