Equipment
EPR spectroscopy
Benchtop CW X-band spectrometer
| Model | Magnettech ESR5000 |
| Temperature control | Variable temperature unit (T = 93 K – 473 K), finger Dewar |
CW X-band spectrometer
| Model | Bruker EMXplus |
| Resonators | ER4122SHQE with optical access, ER4119HS, ER4103TM, ER4116DM (dual-mode) with optical access |
| Temperature control | Continuous-flow cryostat (Oxford Instruments ESR900, T = RT – 5 K) |
CW/pulsed X/Q-band spectrometer with shaped pulses and ENDOR
| Model | Bruker Elexsys E580 |
| Frequency bands | X (9.5 GHz), Q (34 GHz) |
| X-band resonators | ER4118X-MS2, ER4118X-MD5W, EN4118X-MD4W (ENDOR) |
| X-band pulse amplifier | 1 kW TWT |
| Q-band resonators | ER5106QT-IIW, EN51017D2 (ENDOR) |
| Q-band pulse amplifier | 300 W TWT |
| Temperature control | Cryogen-free cryostat (Cryogenic, T = 325 K – 3 K) |
| Signal digitiser | SpecJet III (0.5 ns time resolution, 14 bit amplitude resolution) |
| AWG | SpinJet AWG generator (0.625 ns time resolution, 14 bit amplitude resolution) |
| ENDOR | DICE ENDOR generator (100 kHz – 250 MHz), 150 W RF amplifier |
High-sensitivity home-built pulsed X-band spectrometer
| Microwave source | DC-12 GHz vector signal generator with low phase noise |
| Pulse generator | 16-bit AWG with 540 MHz bandwidth |
| Signal digitiser | 500 MS/s, 14 bit digitiser with on-board averaging |
The equipment further includes an ultra-low-noise cryogenic probehead, providing >10× signal-to-noise improvement, and superconducting microwave resonators.
Additional equipment
Tuneable pulsed Laser with broadband OPO
| Model | Litron Aurora II Integra OPO A23-39-21 |
| Pump source | Q-switched Nd:YAG |
| Wavelength range | 410 nm – 710 nm (signal) / 710 nm – 2600 nm (idler) |
| Pulses | 39 mJ (signal) / 14 mJ (idler), 6 ns, 21 Hz repetition rate |
Spectroelectrochemical setup
The Roessler research group has developed a home-built setup based on film electrochemistry for the generation of paramagnetic intermediates inside the EPR capillary and their characterisation under precise electrochemical conditions.
For further information, please contact Dr Maxie Roessler.