Fig. 4
From: Rapid multiple-quantum three-dimensional fluorescence spectroscopy disentangles quantum pathways
Fourth-order three-dimensional 1Q–2Q-1Q spectrum of TIPS–TAP2− in THF. a Experimental and c simulated 3D spectra, both shown in absolute values. Isosurfaces are drawn at 11, 25, and 60% of the maximal signal. Contour lines of the 2D projections are drawn at linearly spaced levels of each normalized projection. b Double-sided Feynman diagrams that correspond to the 1Q–2Q–1Q process, highlighting the coherence density matrix elements that are relevant for 1Q–2Q and 2Q–1Q 2D spectra in green and pink, respectively. Each pathway is labeled according to its sign, where Φ denotes the pathway-specific fluorescence quantum yield that is dependent on the finally prepared population state (marked by the index)
