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This joint theoretical and experimental study establishes that the adsorptionof polycyclic aromatic hydrocarbons (PAHs) onto the amorphous ice surfaceprovokes a broadening and redshift of the "dangling" OH (dOH) ice spectralfeature, the redshift increasing with PAH size up to $\sim$ 85~cm$^{-1}$. Italso reveals that, in certain interaction configurations, adsorption inducessubstantial reorganisation of the hydrogen-bonding network at the ice surface.Comparison with experiments validates the novel theoretical methodology relyingon the density functional based tight binding approach, which offers acompromise between system size and accuracy enabling a wide sampling of surfacestructures. Applied in an astrophysical context, this study suggests thatwidening of the dOH feature by adsorption of aromatic molecules could explainits absence heretofore in observational ice spectra, offering hope that futuremissions with higher sensitivity will verify its presence or absence in denseregions.

Perturbation of the Surface of Amorphous Solid Water by the Adsorption of Polycyclic Aromatic Hydrocarbons