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. 2016 Dec 27;114(2):322–327. doi: 10.1073/pnas.1612480114

Fig. 1.

Fig. 1.

Experimental data of aqueous solutions of methane, ethane, krypton, and xenon. (A) The purple line represents the IR spectrum of the solvent mixture (2.8% HDO in H2O). The black line represents the spectrum of the pure unperturbed HDO molecules obtained by subtracting the spectrum of pure H2O from the spectrum of the solvent mixture recorded under the same conditions. Inset shows the region of interest—the decoupled O-D stretching mode (νOD). The black line represents the νOD of the pure unperturbed HDO molecules. The red line represents the νOD of the perturbed and unperturbed HDO molecules of the solution containing a small amount of methane. (B) Spectra of the νOD of the HDO molecules perturbed by methane, ethane, xenon, and krypton. (C) Comparison of the spectra of the νOD region: liquid HDO in H2O (293 K and 1 bar; black), perturbed HDO molecules in the methane solution (red), methane HDO clathrate (blue), and HDO ice (green). The spectra are normalized to the same height. (D) Phase PT diagram of the equilibrium between solid methane clathrate and methane aqueous solution [circles (62) and line (63)]. The red circles show the positions of four measurements used to obtain spectra of methane solutions. The blue circle shows the position of solid methane clathrate used to obtain the spectrum in C.