Figure 5. Heterodyned Transient Grating (TG) of DGdm⁺ in D₂O.

(a) Three tensor components of the experimental (red, blue and black curves) and simulated (circles, squares and triangles) heterodyned TG signals XXXX, XXYY and XYYX are shown. The signals are recorded at the maximum of the photoinduced absorption (1575 cm⁻¹). The smooth red curve almost coincident with the black curve for XYYX is a single exponential decay.

The simulation used parameters from Table 2 with ω₁= 1593.1 cm⁻¹, ω₂= 1604.5 cm⁻¹, Δ = 1.6 ps⁻¹, and k_et=1.1 ps⁻¹ for the best fits.

(b) Anisotropy decay of DGdm⁺ in D₂O from the TG measurement XXXX and XXYY. Experimental (black), the double exponential decay fit (red) and simulated (circles) anisotropy probed at the maximum of photoinduced absorption (1575 cm⁻¹).