The homebuilt S-Band Spectrometer

Since 1998, a spectrometer has been developed whose operating frequency can be set between 2.7 and 3.7 GHz, corresponding to magnetic fields of 900 to 1300 G. This spectrometer is mainly used for pulsed EPR, although also cw experiments are feasible. The probehead is located inside an Oxford Instruments CF935 cryostate, whose temperature can be controlled between 4 K and roomtemperature.

In the recent setup, different bridge-loop-gap cavities [1] are used.

All devices are connected to an Intel Pentium PC via an IEEE 488 bus. Data acquisition and experiment control is done by means of a homewritten C program running under a linux enviroment.

Most recently the spectrometer design has been extended to PELDOR. Here you can have a look on a detailed block diagram of the setup.

Here you can download a poster with further informations about the S-Band spectrometer and its applications.

Here you can see a typical application of the S-Band spectrometer. This is a 3 pulse ESEEM on a tyrosine radical in photosystem II.

Here you can have a look on the spectrometer.