EMR Instruments

The Electron Magnetic Resonance (EMR) facilities offer users several home-built, high-frequency and high-field continuous-wave (c.w.) instruments providing frequency coverage from 9 GHz to 1 THz, with additional frequencies available up to 2.5 THz using a molecular gas laser. For a detailed description of how to make the most of our facilities, please read High-Frequency and High-Field EPR/ESR in Tallahassee, FL: Tips and advice on sample preparation (PDF, 5.15MB), from EPR Newsletter (pp. 12-14).

Heterodyne Quasi-Optical Spectrometer

This 120-336 GHz instrument is coupled to a 12.5 tesla superconducting magnet with a homogeneity of 10-5 over a 10 mm sphere.

Transmission Spectrometer

Although the absolute sensitivity of this 24-660 GHz transmission device is lower than that of the quasi-optical system, samples for the transmission apparatus may be very large (0.5 mL and above), thus offsetting the sensitivity disadvantage. The instrument is coupled to a 15/17 T superconducting magnet.

W-Band HiPER Spectrometer

A new high power (~1 kW) quasi-optical W-band (94 GHz) spectrometer (HiPER) is now available for continuous wave and pulsed EPR measurements. Its high power enables generation of short pulses with large excitation bandwidths, leading to enhanced sensitivity for pulsed EPR including DEER (~two orders of magnitude improvement over conventional X-band spectrometers).

Broadband Backward Wave Oscillator (BWO) Spectrometer

Using sub-THz and THz wave sources (BWOs), this transmission-type EPR/ESR spectrometer can be quasi-continuously frequency-tuned via applied voltage.

Broadband Millimeter Wave Vector Network Analyzer (MVNA) Spectrometer

Several broadband (continuous from 8 GHz to 1 THz) instruments based on MVNA spectrometers have been configured for high-sensitivity oriented single-crystal measurements, enabling EPR studies simultaneously as a function of field orientation, pressure and temperature.

XW-Band Bruker Pulsed Spectrometer

A Bruker Elexsys 680 instrument operating at X-band (9 GHz) and W-band (94 GHz) is available for continuous wave and pulsed EPR measurements. Pulsed capabilities include T1/T2 relaxation, DEER, ENDOR, ESEEM and saturation recovery.