Fig. 3

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Spectra of two H2O:NH3:H2S mixtures at 15 and 135 K. The plot insets zoom in on two features of interest in this work, the SH− stretching mode and the NH4+ asymmetric bending (ν4) mode. The dashed vertical lines within the right inset indicate the peak positions of the NH4+ ν4 mode at the two plotted temperatures, showing how the feature redshifts as the ice is heated. Vibrational mode assignments are provided for the H2O:NH3:H2S mixture at 135 K.
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