Fig. 3. Terahertz inter-triplet coherences in zero-quantum spectra.
(A) Magnitude zero-quantum spectrum taken at τ = 0 fs and 20 K. Two sidebands due to inter-triplet coherences are observed. (B) Evolution of normalized slices taken along the dashed red line in (A) at ħωτ = 1890 meV as a function of delay τ (at 20 K) and temperatures [10, 15, 20, 25, 30, 40] K (at τ = 0 fs). (C) Fit of normalized cross-slice taken at τ = 0 fs, in which the complex Lorentzians of peaks 6 and 8 are shifted by phases −π/2 relative to peak 7. The shaded curves represent the real quadratures of each Lorentzian in the fit line shape, and the top plot is the phase of the fitted complex line shape.