Fig. 2: Experimental absorption spectra. | Nature Communications

Fig. 2: Experimental absorption spectra.

From: Spectral signatures of excess-proton waiting and transfer-path dynamics in aqueous hydrochloric acid solutions

Fig. 2

a Experimental THz/Fourier-transform infrared (THz/FTIR) absorption spectra of HCl solutions at various concentrations (colored broken lines for 2 M to 10 M), compared to literature data of pure water74 (blue broken line). The experimentally measured extinction spectra have been converted into energy absorption spectra using the Kramers–Kronig relation, no amplitude adjustment is used in the comparison with the ab initio spectra (solid lines). b Experimental and ab initio molecular dynamics (MD) difference spectra derived from the results given in a and plotted in the respective colors and line styles. c The experimental difference spectra (shown in b) are divided by the HCl concentration cHCl (colored broken lines) and compared to the average of the simulated difference spectra after dividing by cHCl (black solid line).

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