THz Electron Paramagnetic Resonance / THz Spectroscopy at BESSY II

Abstract

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.

Single‐Chain Magnet Based on Cobalt(II) Thiocyanate as XXZ Spin Chain

“…FD‐FT THz‐EPR spectra were acquired at the THz‐EPR user‐station of the electron‐storage ring BESSY II. The setup is described in detail elsewhere . THz coherent synchrotron radiation (CSR) or broadband, unpolarized THz radiation emitted by the Hg arc lamp of an FTIR spectrometer (Bruker IFS 125) were used as broadband (ca.…”

Recent progress in synchrotron-based frequency-domain Fourier-transform THz-EPR

“…Based on these achievements, we recently set up a dedicated FD-FT THz-EPR end-station at BESSY II [21,22] and applied it successfully to different mono-nuclear [23][24][25][26][27] and exchange coupled multi-nuclear HS systems [21,[28][29][30][31].…”

Epitaxial Ge2Sb2Te5 probed by single cycle THz pulses of coherent synchrotron radiation

“…7,8 On the contrary, several opticalpump/X-ray-probe can be found in the literature. 9,10 In addition, some of us using the THz beamline 11 at Bessy II reported a huge absorbance contrast between the GST phases in a specific frequency band. 12 Thus, the wide tunability of the coherent synchrotron radiation (CSR) in the THz range is highly acceptable.…”