Microwave frequency modulation in continuous-wave far-infrared ESR utilizing a quasi-optical reflection bridge

Bálint Náfrádi, Richard Gaál, T. Fehér, László Forró

Research output: Contribution to journalArticle

21 Citations (Scopus)

Abstract

We report the development of the frequency-modulation (FM) method for measuring electron spin resonance (ESR) absorption in the 210- to 420 GHz frequency range. We demonstrate that using a high-frequency ESR spectrometer without resonating microwave components enables us to overcome technical difficulties associated with the FM method due to nonlinear microwave-elements, without sacrificing spectrometer performance. FM was achieved by modulating the reference oscillator of a 13 GHz Phase-Locked Dielectric Resonator Oscillator, and amplifying and frequency-multiplying the resulting millimeter-wave radiation up to 210, 315 and 420 GHz. ESR spectra were obtained in reflection mode by a lock-in detection at the fundamental modulation frequency, and also at the second and third harmonic. Sensitivity of the setup was verified by conduction electron spin resonance measurement in KC60.

Original languageEnglish
Pages (from-to)265-268
Number of pages4
JournalJournal of Magnetic Resonance
Volume192
Issue number2
DOIs
Publication statusPublished - Jun 2008

Fingerprint

optical reflection
Microwave frequencies
Electron Spin Resonance Spectroscopy
Frequency modulation
Microwaves
microwave frequencies
frequency modulation
continuous radiation
Paramagnetic resonance
electron paramagnetic resonance
Infrared radiation
Spectrometers
oscillators
spectrometers
microwaves
Dielectric resonators
Millimeter waves
conduction electrons
millimeter waves
electromagnetic radiation

Keywords

  • ESR
  • Frequency modulation
  • KC
  • Quasi-optical bridge

ASJC Scopus subject areas

  • Molecular Biology
  • Physical and Theoretical Chemistry
  • Spectroscopy
  • Radiology Nuclear Medicine and imaging
  • Condensed Matter Physics

Cite this

Microwave frequency modulation in continuous-wave far-infrared ESR utilizing a quasi-optical reflection bridge. / Náfrádi, Bálint; Gaál, Richard; Fehér, T.; Forró, László.

In: Journal of Magnetic Resonance, Vol. 192, No. 2, 06.2008, p. 265-268.

Research output: Contribution to journalArticle

Náfrádi, Bálint ; Gaál, Richard ; Fehér, T. ; Forró, László. / Microwave frequency modulation in continuous-wave far-infrared ESR utilizing a quasi-optical reflection bridge. In: Journal of Magnetic Resonance. 2008 ; Vol. 192, No. 2. pp. 265-268.
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