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).

HiPER’s unique quasi-optical design also allows for large area, non-resonant sample holders that exhibit increased concentration sensitivity for CW EPR relative to commercial W-band instruments.

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Panoramic View


  • Specs

  • Compatible Techniques

  • Sample Types

  • Frequency: 94 GHz
  • Field Strength: 9 tesla
  • Bore Diameter: 88 mm
  • Homogeneity: 20 ppm
  • Number of input and output leads possible: 2
  • Temperature: 4 to 300 K
  • Sensitivity: Concentration sensitivity at 290K is ~ 1 µM nitroxide spins
  • Sample Size: 30 to 600 µL
  • Open for users who would pay for magnet time: Yes
  • Air-sensitive or reactive sample
  • Frozen solutions
  • Liquids
  • Powders & polycrystals
  • Single crystal
  • Thin films


Click on images for details.

Related Publications

Kaur, P., et al, Selective Membrane Disruption Mechanism of an Antibacterial γ-AApeptide Defined by EPR Spectroscopy, Biophysical J., 110, 8, 1789-1799 (2016) Read online

Song, L., et al, Towards Increased Concentration Sensitivity for Continuous Wave EPR Investigations of Spin-Labeled Biological Macromolecules at High Fields, Magn. Reson., 265, 188-196 (2016) Read online

Cruickshank PA, et al, A kilowatt pulsed 94 GHz electron paramagnetic resonance spectrometer with high concentration sensitivity, high instantaneous bandwidth, and low dead time, Rev Sci Instrum. 2009 Oct;80(10):103102. doi: 10.1063/1.3239402 Read online

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Last modified on 21 June 2021