Multipurpose High-Frequency ESR Spectrometer for Condensed Matter Research

Kálmán L. Nagy, Dario Quintavalle, Titusz Fehér, András Jánossy

Research output: Contribution to journalArticle

15 Citations (Scopus)


We describe a multifrequency quasi-optical electron spin resonance (ESR) spectrometer operating in the 75-225 GHz range and optimized at 222.4 GHz for general use in condensed matter physics and chemistry. The quasi-optical bridge detects the change of millimeter wave polarization at the ESR condition. A controllable reference arm maintains a millimeter wave bias at the detector. The sensitivity of 2 × 1010 spin/(G Hz0.5), measured on a dilute Mn:MgO sample in a non-resonant probe head at 222.4 GHz and 300 K, is comparable to that of commercial high-sensitive X-band spectrometers. The spectrometer is robust, easy to use and may be operated by undergraduate students. Its performance is demonstrated by examples from various fields of condensed matter physics.

Original languageEnglish
Pages (from-to)47-63
Number of pages17
JournalApplied Magnetic Resonance
Issue number1
Publication statusPublished - Feb 1 2011

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

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