Enhanced accuracy of the microwave field strength measurement in a CW-EPR by pulsed modulation technique
| Autor: | Boris Rakvin, Marina Kveder, Dejana Carić |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2018 |
| Předmět: |
Nuclear and High Energy Physics
Materials science Spectrometer 010308 nuclear & particles physics Biophysics Field strength Quantum Physics Condensed Matter Physics 01 natural sciences Biochemistry Physics::History of Physics law.invention Amplitude modulation Laser linewidth law EPR spectroscopy Microwave field strength Modulation spectrum EPR Bloch-Siegert shift 0103 physical sciences Continuous wave Atomic physics 010306 general physics Electron paramagnetic resonance Frequency modulation Microwave |
| Popis: | The microwave magnetic field strength, B1, in the cavity of a conventional continuous wave electron para- magnetic resonance, CW-EPR, spectrometer was measured by employing modulation sidebands, MS, in the EPR spectrum. MS spectrum in CW-EPR is produced by applying the modulation frequency, xrf, which exceeds the linewidth, dB, given in frequency units. An amplitude- modulated CW-EPR, AM-CW-EPR, was selected as detection method. Theoretical description of AM-CW-EPR spectrum was modified by adding Bloch-Siegert-like shift obtained by taking into account the cumulative effect of the non-resonant interactions between the driving fields and the spin system. This approach enables to enhance the pre- cision of B1 measurement. In order to increase the sensitivity of the method when saturation effects, due to higher intensity of B1, decrease the resolution of AM-CW- EPR spectrum, detection at the second harmonic of CW-EPR has been employed. |
| Databáze: | OpenAIRE |
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