Electron Paramagnetic Resonance Facility

Theodor Agapie – Faculty Advisor
Jonas C. Peters – Faculty Advisor

Paul H. Oyala – Director


The Electron Paramagnetic Resonance Facility (EPR) facility at Caltech is a multi-user magnetic resonance spectroscopy facility that provides access to state of the art instrumentation for characterization of samples containing paramagnetic species (e.g. organic radicals, open-shell transition metal complexes, defects in materials, spin labeled biomolecules, etc.). Our primary objective is to provide a broad suite of continuous-wave (CW) and pulse EPR spectroscopies for the detailed characterization of paramagnetic species to the Caltech community and surrounding institutions. The facility provides the appropriate equipment and expertise for determination of optimal experiments suited to the specific subject of study, and analysis of data acquired towards elucidation of the geometric and electronic structure of the species of interest.


The Caltech EPR facility is equipped with two Bruker EPR spectrometers: an EMX X-band continuous-wave (CW) EPR spectrometer, and Bruker ELEXSYS E580 pulse EPR spectrometer capable of pulse and CW EPR spectroscopy at both X and Q-bands, as well as a variety of electron-electron double resonance (ELDOR) and electron-nuclear double resonance (ENDOR) spectroscopies for more detailed study of electron-electron and electron-nuclear magnetic interactions than is accessible by CW methods alone.


Paul H. Oyala, Ph. D.


  • 250A – Crellin Laboratory
  • Mail Code 164-30
  • (626) 395-4885
  • phoyala@caltech.edu

Prof. Theodor Agapie

Faculty Advisor

  • 314 – Noyes Laboratory
  • Mail Code 127-72
  • (626) 395-3617
  • agapie@caltech.edu

Prof. Jonas Peters

Faculty Advisor

  • 201C – Schlinger Laboratory
  • Mail Code 101-20
  • (626) 395-3113
  • jpeters@caltech.edu

Lab Contact Information

  • B264 – Crellin Laboratory
  • Mail Code 164-30
  • (626) 395-6055
  • phoyala@caltech.edu