Fig. 4: Comparison of conventional and THz Stark spectroscopy.
From: Time-resolved THz Stark spectroscopy of molecules in solution
a, b Low temperature (77 K) and room temperature (295 K) absorption spectra of (a) TTF-BTD and (b) anthanthrene. c, d Conventional Stark spectra measured at 77 K for two values of the angle χ between the polarization of the THz and the probe pulses. e, f THz Stark spectra recorded at room temperature for parallel and perpendicular orientation of THz and probe polarization. For direct comparison the y-scale is in units of Δϵ scaled to an electric field of 1 MV/cm. The gray dotted vertical lines are guides to the eye and help to visualize the shift of the spectra at the different temperatures.
