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Fig. 1

IR spectra from 4000 cm-1 to 500 cm-1 of Ar:C2H2 100:1 (top), pure C2H2 (middle) and H2O:C2H2 10:1 (bottom) at 12 K. In the bottom panel, a zoom of the OH and CH stretching region is added to reveal the weak CH stretching mode of C2H2.
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