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Bruker EMXplus EPR Spectrometer |
The Bruker EMXplus EPR Spectrometer System is the latest addition to the
Spectroscopy Facilities. EPR (Electron Paramagnetic Resonance) is a very useful
and powerful technique for studying samples that are paramagnetic (i.e. have
unpaired electrons). Applications of EPR include:
- Kinetics of radical reactions
- Redox processes
- Metal ions
- Defects in crystals
- Polymer properties
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- Effects of ionizing radiation
- Spin labeling and spin trapping
- Antioxidants
- Enzyme and carcinogenic reactions
- and many more
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Spectrometer Features:
- Microwave Frequency Range: CW X-Band (9 - 9.8GHz)
- X-Band Solid State Ultra Low Noise Microwave Bridge
- Max leveled source output: 200 mW
- Max. attenuation: 60 dB
- Tuning range: 60 MHz
- Integrated Bridge Controller w/ real time display for
optimizing parameters
- Digital Ultra High Resolution Hall Field Controller
- Operating Range: 100 G - 18 kG
- Sweep Range: up to 0 - 18 kG (0 - 1.8 mT) in one scan
- High Linearity Modulation Amplifier Module: 500 Hz - 120 kHz
- High Sensitivity Probehead
- Q > 15,000
- Optical window for photactivated experiments
- Up to 10mm sample tube access
- Max. modulation amplitude: 20 G
- Automatic cavity tuning and matching
- AquaX and Flat Cell accessories for aqueous samples
- Nitrogen and Helium cryostats for VT and Low T experiments, respectively
- ENDOR Probehead w/ freqency range of 1 - 100 MHz
- Simulation Software: XSophe
Experiments:
- Room Temperature
- Time Scans - for kinetics studies
- 2D - a second parameter, such as, power or temperature, can be varied
along with the magnetic field
- Cryogenic Experiments:
- Variable Temperature using liquid N2
Range: 100K - 700K
Sample Tube Requirements: Max O.D. = 4 mm
- Low Temperature using liquid He
Range: 4K - 100K
Sample Tube Requirements: Only O.D. = 4 mm
- ENDOR - Electron-Nuclear DOuble Resonance
Advanced notice of 2 weeks must be given to Nicole Holstrom and Jerry Hu if
cryogenic experiments wish to be performed because cryogens must be ordered
and the system has to be prepared/setup.
If ENDOR experiments wish to be performed, please make an appointment with Nicole
and/or Jerry.
EPR sample tubes are made out of quartz due to it being free from paramagnetic
impurities. NMR tubes can be used if the signal from the sample is strong,
however, since they are made out of Pyrex, an iron peak may be seen in the
spectra if the sample's signal is weak.
To purchase EPR sample tubes, click on the following link:
Wilmad Labglass - EPR Sample Tubes
Training
Everyone must first be trained for the Room Temperature Experiments before moving
on to cryogenic and/or ENDOR experiments. Please fill out the
EPR Training Request Form and indicate
which experiment(s) you would like to do; please check all that apply.
Please contact Nicole Holstrom at
holstrom@mrl.ucsb.edu
if you have any questions,
comments, or concerns.
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