THz Electron Paramagnetic Resonance THz Spectroscopy

The THz beamline at BESSY II employs high power broadband femto to picosecond long THz pulses for magneto optical THz and FIR studies. A newly designed set up exploits the unique properties of ultrashort THz pulses generated by laser energy modulation of electron bunches in the storage ring or alternatively from compressed electron bunches. Experiments from 0.15 to 5 THz 5 150 cm 1 may be conducted at a user station equipped with a fully evacuated high resolution FTIR spectrometer 0.0063 cm 1 , lHe cooled bolometer detectors, a THz TDS set up and different sample environments, including a superconducting high field magnet 11 T 11T with variable temperature insert 1.5 K 300 K , a sample cryostat and a THz attenuated total reflection chamber. Main applications are Frequency Domain Fourier transform THz Electron Paramagnetic Resonance FD FT THz EPR , THz FTIR spectroscopy and optical pump THz probe time domain spectroscopy TDS , with sub ps time resolution