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The cw X - Band Spectrometer

In our group we have a cw ESP300 X-band spectrometer manufactured by Bruker AG. In 2000 the spectrometer was partly upgraded to an Elexsys E500 spectrometer (Bruker BioSpin).

Several different cavities are in use, allowing us to perform normal as well as parallel mode EPR and including ENDOR-type experiments. Two different cryostats can be applied to the system, allowing the control of temperature in the range from 4 - 353 K. Either liquid helium or liquid nitrogen can be used for cooling the cavities. Experimental control and data acquisition is performed by means of a computer. The system is equiped with a signal channel (ER 023), a digital field controller (ER 032M), a FF-Lock (ER 033) and a NMR-Gaussmeter (ER 035M). All these components are located in the console (ER 220 D LR). For ENDOR measurements, a cylindric ENDOR cavity (EN 801) is used. The radio frequencies are synthesised by a Wavetek 3000 synthesiser and are amplified by a solid-state 300 W ENI Amplifier (ENI A-300). The Laser (Nd:YAG) could be used for 'uncaging' radicals on biomolecule systems.