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The MagLab is funded by the National Science Foundation and the State of Florida.

XQ-Band Bruker Pulsed Spectrometer

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.



  • Frequency: 9 - 34 GHz
  • Field Strength: 6 tesla superconducting magnet
  • Bore Diameter: 32 mm
  • Temperature: 4 K to 300 K
  • Sensitivity: Concentration sensitivity at 290K is ~ 1 µM nitroxide spins at X-band and ~ 10 µM at W-band
  • Sample Size: 3 to 100 µL at X-band; 0.4 µL at W-band

A collection of resonators are available for different applications and sample types, including:

  • MD-5 dielectric resonator
  • MS-3 split-ring resonator
  • ENDOR resonator
  • Several c.w. cavities

  • Air-sensitive or reactive sample
  • Aqueous solutions
  • Frozen solutions
  • Powders & polycrystals
  • Single crystal
  • Thin films

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Images & Sample Data

Credit: National MagLab

Related Publications

Lumata, L., et al, Electron spin resonance studies of trityl OX063 at a concentration optimal for DNP, Phys. Chem. Chem. Phys., 15 (2013) Read online.

Sun ZY, et al, Disruption of Helix-Capping Residues 671 and 674 Reveals a Role in HIV-1 Entry for a Specialized Hinge Segment of the Membrane Proximal External Region of gp41, J Mol Biol. (2013) Read online.

Vileno, B, et al, Broad disorder and the allosteric mechanism of myosin II regulation by phosphorylation, P. Natl. Acad. Sci. U.S.A., ,108 (20), 8218-23 (2011) Read online.

Kim, M, et al, Antibody mechanics on a membrane-bound HIV segment essential for GP41-targeted viral neutralization, Nature Struct. Mol. Biol., 18 (2011) Read online.

Song L, et al, Distance and dynamics determination by W-band DEER and W-band ST-EPR, Eur Biophys J. Mar; 39(4):711-9. (2010) Read online.

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Last modified on 22 August 2023

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