dorsal/arxiv
View SchemaHigh frequency single-mode resonators for EPR spectroscopy enabling rotations of the sample about two orthogonal axes
| Authors | G. Annino, M. Cassettari, M. Fittipaldi, M. Martinelli |
|---|---|
| Categories | |
| ArXiv ID | physics/0504159 |
| URL | https://arxiv.org/abs/physics/0504159 |
| DOI | 10.1016/j.jmr.2005.05.011 |
Abstract
A novel single-mode resonant structure which enables the rotation of the sample about two orthogonal axes is investigated in view of electron paramagnetic resonance applications. The proposed solution is based on cylindrical nonradiative resonators laterally loaded by the sample holder. The resulting structure can still operate in nonradiative regime, although no longer rotationally invariant. These theoretical predictions, based on symmetry considerations, are confirmed by means of a finite element numerical modelling. Theoretical and computational results are then substantiated by experimental investigations at millimeter wavelengths. As a result, a single-mode resonator which enables all the relevant rotations of the sample is demonstrated at millimeter wavelengths for the first time. In this resonator the intensity of the microwave field on the sample and its orientation with respect to the static magnetic field can be kept constant during the rotations. Therefore, a complete characterization of anisotropic systems is possible at the highest sensitivity, without the need of split-coil magnets. Possible applications at very high frequencies are discussed.
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"abstract": "A novel single-mode resonant structure which enables the rotation of the\nsample about two orthogonal axes is investigated in view of electron\nparamagnetic resonance applications. The proposed solution is based on\ncylindrical nonradiative resonators laterally loaded by the sample holder. The\nresulting structure can still operate in nonradiative regime, although no\nlonger rotationally invariant. These theoretical predictions, based on symmetry\nconsiderations, are confirmed by means of a finite element numerical modelling.\nTheoretical and computational results are then substantiated by experimental\ninvestigations at millimeter wavelengths. As a result, a single-mode resonator\nwhich enables all the relevant rotations of the sample is demonstrated at\nmillimeter wavelengths for the first time. In this resonator the intensity of\nthe microwave field on the sample and its orientation with respect to the\nstatic magnetic field can be kept constant during the rotations. Therefore, a\ncomplete characterization of anisotropic systems is possible at the highest\nsensitivity, without the need of split-coil magnets. Possible applications at\nvery high frequencies are discussed.",
"arxiv_id": "physics/0504159",
"authors": [
"G. Annino",
"M. Cassettari",
"M. Fittipaldi",
"M. Martinelli"
],
"categories": [
"physics.ins-det"
],
"doi": "10.1016/j.jmr.2005.05.011",
"title": "High frequency single-mode resonators for EPR spectroscopy enabling rotations of the sample about two orthogonal axes",
"url": "https://arxiv.org/abs/physics/0504159"
},
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