Multi-frequency EPR is the tool to disentangle magnetic field dependent from independent terms. Bruker BioSpin's EPR product range currently encompass two orders of magnitude in microwave frequencies:
While the advantages of high frequency EPR are obvious, low frequency EPR is the perfect choice for large samples and in particular in-vivo studies (ELEXSYS E540).
Multi-frequency EPR spectra renders simulation much more effective. Also, motion effects can be studied over a wide temporal range.
The majority of CW-EPR systems operates at X-Band. Thus, the first step into multi-frequency CW-EPR is another operation frequency. In case of regular CW-EPR spectroscopy, Q-Band at 34 GHz is the best choice, because...
The following table provides a list of the most common EPR frequencies with their frequency range and g=2 field value for radical species, respectively (cf. also What is EPR? CW EPR Theory). All these frequencies are commonly offered by our selection of magnet systems.
|v / GHz||0.8-1.2||3.4-3.8||9-10||34||94|
|g = 2 / kG||0.35||1.3||3.4||12.2||33.5|
Multi-frequency EPR by Bruker BioSpin is not limited to CW-EPR only. Bruker BioSpin's EPR products allow real multi-frequency and multi-resonance EPR, ENDOR and ELDOR both in CW- and Pulsed mode. For instance, thanks to the Intermediate Frequency (IF-) concept, an X-Band E580 system can readily be upgraded to Q-Band (SuperQ-FT).