National Biomedical Electron Paramagnetic Resonance Center

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EPR Spectrometers


Bruker ELEXSYS EPR Spectrometer Systems (2)

Special Features: Super X bridge, high dynamic range (90 dB), X-band, 10-inch magnet, Super Hi-Q resonator, ER 4103TM cylindrical resonator, ER 4116DM dual-mode TE102/TE012 resonator ER 4117D-R dielectric resonator, ER 4117D-M dielectric mixing resonator, ER 4119HS-WI high-sensitivity optical resonator, and liquid nitrogen cryostat. One of the ELEXSYS spectrometers is equipped with field frequency lock, helium cryostat, Bruker DICE ENDOR with ENH01252 cavity, A300 RF power amplifier (0.3 to 35 MHz), and 3100L RF power amplifier (250 kHz to 105 MHz). Bruker E-600 series W-band CW-EPR (including W-band cylindrical resonator, W-band bridge, superconducting magnet, room temperature sweep coils, and cryostat).

Bruker ELEXSYS 580 Pulsed Spectrometer

Special Features: Pulse X-band spectrometer and Q-band with DEER, DQC, and ENDOR capabilities at cryogenic temperatures.

Applications: To measure long-range distances between paramagnetic probes and/or coupled nuclei within biomedically-relevant proteins and peptides.

Varian E-109 Century Series EPR Spectrometers (2)

Special Features: Field-frequency locks; photomodulation from dc to 5 kHz; saturation transfer spectroscopy; excellent sensitivity; loop-gap resonators.

Applications: EPR of free radicals in solution; EPR of metal complexes in frozen solution; photoexcited paramagnetic states; spin-label studies; spin-label studies of cellular membrane fluidity and oxygen uptake.

Bruker EMX Spectrometer

Special Features: Standard high-quality X-band research instrument.

Applications: Photoexcited paramagnetic states; spin-label studies; spin-label studies of cellular membrane fluidity and oxygen uptake.

Varian E-9 EPR Multifrequency Spectrometer

Special Features: 0.5 to 1 GHz bridge; L-band 1-2 GHz bridge; S-band 2-4 GHz bridge; C-band 4-8 GHz bridge; K-band 18 GHz bridge; Q-band 35 GHz bridge; various loop-gap resonators; liquid helium cooling at all of the above frequencies (down to 15-20 K).

Applications: Transition metal EPR; forbidden transitions; in vivo studies on mice; study of very small samples at 35 GHz.

Time-Domain ESR Spectrometer at 9 GHz with 9-inch Magnet

Special Features: Saturation recovery capability to 0.1 microsecond; very high speed data acquisition system.

Applications: Measurement of T1 of spin labels; measurement of transient response of spin systems to various excitations.

Multifrequency Time-Domain EPR Spectrometer with Bruker 10-inch Magnet

Special Features: Saturation recovery capability to 0.1 microsecond; very high speed data acquisition system; microwave frequencies at 2-4 GHz and 18 GHz.

Applications: Measurement of T1 of spin labels; measurement of transience response of spin systems to various excitations.

Multiquantum X-Band EPR Spectrometer with Jagmar 9-inch Magnet

Special Features: X-band multiquantum EPR; X-band multiquantum ELDOR.

Applications: General purpose EPR techniques. Spectra are proportional to T1T22 rather than the usual linear dependence on T2.

Multiquantum Q-Band Spectrometer with 10-inch Bruker Magnet

Special Features: Multiquantum and saturation recovery spectroscopy at 35 GHz.

Applications: Resolution of multiple spectral components that arise from conformational equilibria.

Varian E-4 EPR Spectrometer

Special Features: Converted Frat equipped with E-101 reference arm microwave bridge.

Applications: Used for routine X-band spectroscopy.

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Page Updated 09/17/2013