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Electron Paragmagnetic Resonance (EPR)
The UA EPR facility in Chemistry Department includes 4 instruments in a 1300 sq ft state-of-the-art laboratory (Shelby L108):
| X-band/Q-band CW-EPR spectrometer:Varian E-12 EPR spectrometer with 9-GHz (X-band) and 35-GHz (Q-band) microwave bridges, rotating magnetic base, rapid scan accessories, a Varian Century series EPR system with 12 inch magnet. EPR data acquisition is provided by a PC (3 GHz running Windows XP) via the Platform-Independent Data Acquisition Module (PIDAM) connected to the spectrometer. |
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X-band CW-ENDOR spectrometer: Bruker-ESP 300-10/7 with an ESP 350-U DICE ENDOR/TRIPLE accessory and an A-500 RF power amplifier allows CW ENDOR measurements in the 0.3 – 35 MHz frequency range at temperatures from 100 up to 350 K. |
| X-band pulsed-EPR spectrometer: Bruker ELEXSYS E-580 pulsed-EPR spectrometer includes the E-560D-pulse ENDOR and E-580-pulse ELDOR accessories. This allows us to operate echo-detected EPR, 2- and 3-pulse 1D ESEEM, 2D ESEEM (HYSCORE), pulsed ENDOR, pulsed ELDOR (DEER), inversion recovery and transient EPR at 9-10 GHz. We plan to add a TRIPLE accessory to the set-up soon. The X-band cavity has optical access and temperature of the cavity is maintained with a liquid-He cryostat. |  |
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W-band CW/pulsed EPR/ENDOR spectrometer: Bruker ELEXSYS E-600 W-band (94 GHz) EPR spectrometer was acquired in 2002, and was upgraded in 2005 with an ELEXSYS E-580 pulse EPR spectrometer. The combined system is known as an E-680 W/X. This instrument was obtained through NSF MRI (W-band CW-EPR system) and the CRIF (pulsed EPR) Instrumentation Programs. At 94 GHz we can perform echo-detected EPR, 2- and 3-pulse 1D ESEEM, inversion recovery, transient EPR and pulsed ENDOR in the frequency range from 1.5 to 400 MHz. The temperature of the cavity is maintained with a liquid-He cryostat, and in situ irradiation of the cavity is possible using a fiber optical cable run down through the sample rod. The E-680 W/X system is controlled through a Linux workstation with Xepr, the EPR acquisition and data manipulation software. |
| Tanya Kanovalova: Dr. Konovalova is manager of the EPR facility at UA. She oversees operation and maintenance of the spectrometers, sets up experiments and obtains data in collaboration with faculty and students, and trains users on the spectrometers. |  |
In addition, variable temperature attachments are available to perform in situ photolysis from 10 to 400 K using:
UV/visible radiation sources available for producing radical and excited intermediates include:
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