High-Field, Multifrequency EPR Spectroscopy Using Whispering Gallery Dielectric Resonators

Annino, G.; Cassettari, M.; Fittipaldi, Maria; Longo, I.; Martinelli, Massimo; Massa, C. A.; Pardi, Luca

doi:10.1006/jmre.1999.1977

Cited by 18 publications

(11 citation statements)

References 28 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Experimental results obtained with the described probe head and resonators made with polyethylene were published elsewhere [29]. The 240 GHz EMR spectrum of a polycrystalline sample of DPPH (2,2-diphenyl-l-picrylhydrazyl, Sigma) at room temperature obtained with a disk of z-cut crystalline quartz, having 18 mm in diameter and 0.9 mm in thickness as a WGMDR, is reported in Fig.…”

Section: Experimental Procedures and Resultsmentioning

confidence: 99%

See 1 more Smart Citation

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

Annino¹,

Cassettari²,

Fittipaldi³

et al. 2000

Appl. Magn. Reson.

View full text Add to dashboard Cite

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 (HF Z -EMR) have been developed. Beyond the single-pass approach the existing HFZ-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 HFZ-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.

show abstract

Section: Experimental Procedures and Resultsmentioning

confidence: 99%

“…This probe makes use of a resonating assembly with a WGMDR and is the prototype of the final probe to be used also at low temperatures. The probe is homemade and has already been used in other experiments published elsewhere [28,29]. The relevant part of this probe is its resonating assembly.…”

Section: The Probesmentioning

confidence: 99%

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

Annino¹,

Cassettari²,

Fittipaldi³

et al. 2000

Appl. Magn. Reson.

View full text Add to dashboard Cite

show abstract

“…The sample access in this resonator (0.6 mm) is comparable to that of a cylindrical TE 011 resonator at W-band. Some High-Frequency EPR Instrumentation 807 attempts have been made to construct alternative resonators exhibiting extremely high Q-values, such as the whispering-gallery-mode (WGM) resonators [87][88][89][90]. Sample handling in these resonators is, however, problematic and up to now the WGM resonator has not been employed regularly in high-field EPR experiments.…”

Section: Other Resonator Designsmentioning

confidence: 99%

High-Frequency EPR Instrumentation

Reijerse¹

2009

Appl Magn Reson

View full text Add to dashboard Cite

An overview of the most recent developments in high-frequency highfield electron paramagnetic resonance (EPR) instrumentation is given. In particular, the practical choices concerning sources, detectors, resonators, propagation systems as well as magnet technology are discussed in the light of various possible applications. Examples of particular homodyne and heterodyne quasi-optic EPR systems illustrate the potential for future developments in EPR technology.

show abstract

“…Among the different applications, an innovative realization of magnetic resonance spectrometers based on dielectric resonators has been recently proposed, specifically useful for high magnetic field applications (4). An effective employment of such devices requires otherwise an accurate modeling of the resonator and of the overall apparatus.…”

Section: Introductionmentioning

confidence: 99%

Complex Response Function of Magnetic Resonance Spectrometers

Annino¹,

Cassettari²,

Fittipaldi³

et al. 2002

Journal of Magnetic Resonance

Self Cite

View full text Add to dashboard Cite

A vectorial analysis of magnetic resonance spectrometers, based on traveling wave resonators and including the reference arm and the automatic control of frequency, has been developed. The proposed model, valid also for stationary wave resonators, gives the response function of the spectrometer for any working condition, including scalar detectors with arbitrary response law and arbitrary excitation frequency. The purely dispersive and purely absorptive linear responses are discussed in detail for different scalar detectors. The developed approach allows for optimizing the performances of the spectrometer and for obtaining the intrinsic lineshape of the sample in a very broad range of working conditions. More complex setups can be modeled following the proposed scheme.

show abstract

High-Field, Multifrequency EPR Spectroscopy Using Whispering Gallery Dielectric Resonators

Cited by 18 publications

References 28 publications

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

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

High-Frequency EPR Instrumentation

Complex Response Function of Magnetic Resonance Spectrometers

Contact Info

Product

Resources

About