Fig. 1 | Scientific Reports

Fig. 1

From: Photostability of polycyclic aromatic hydrocarbons in hydrated magnesium sulfate under Martian ultraviolet irradiation to assist organics detection on Mars

Fig. 1

IR spectra comparison for pure 2,6-dihydroxynaphthalene (red spectrum), \(\:10\:\)wt.\(\:\%\) 2,6-dihydroxynaphthalene adsorbed on hydrated magnesium sulfate (black spectrum) and hydrated magnesium sulfate blank (blue spectrum) in (a) IR \(\:8000-3500\:{cm}^{-1}\) spectral range; (b) IR \(\:3500-450\:{cm}^{-1}\) spectral range; (c) and (d) spectral zooms on 2,6-dihydroxynaphthalene partially shifted bands plausible due to molecule-mineral interaction. Only adsorbed 2,6-dihydroxynaphthalene bands with shifts greater than the resolution of the instrument (\(\:>4\:{cm}^{-1}\)) with respect to the pure 2,6-dihydroxynaphthalene are shown. Legend: \(\:\nu\:\) stretching vibrations; \(\:{\delta\:}_{ip}\) in-plane bending vibrations; \(\:{\delta\:}_{oop}\) out-of-plane bending vibrations.

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