Example of Magnet


240 GHz EPR

•High power and monochromatic FEL radiation enables pulsed EPR at 240 GHz
•Fast relaxation times can be probed at temperatures as high as 190 K

Nd:YAGlasers are used to slice FEL pulse.

FT EPR observation of hyperfine structure of nitrogen centers in diamond.

(a) Echo detectedfor spin label TEMPO molecule up to temperature 190 K.

(b) Determination of the spin dephasing time T_2=63 ns.





FEL powered EPR opens the way to macromolecules characterization in liquid solutions and in-vivo environment.


1. S. Takahashi, L.-C. Brunel, D.T. Edwards, J. van Tol, G. Ramian, S. Han, and M.S. Sherwin “Pulsed electron paramagnetic resonance spectroscopy powered by a free electron laser” Nature 489, p. 409-413 (2012).