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

Eric Michoulier, Céline Toubin, Aude Simon, Joëlle Mascetti, Christian Aupetit, Jennifer A. Noble

Research output: Contribution to journalArticlepeer-review

9 Scopus citations

Abstract

This joint theoretical and experimental study establishes that the adsorption of polycyclic aromatic hydrocarbons (PAHs) onto the amorphous ice surface provokes a broadening and redshift of the "dangling" OH (dOH) ice spectral feature, the redshift increasing with PAH size up to ∼85 cm-1. It also reveals that, in certain interaction configurations, adsorption induces substantial reorganization of the hydrogen-bonding network at the ice surface. Comparison with experiments validates the novel theoretical methodology relying on the density functional-based tight binding approach, which offers a compromise between the system size and accuracy, enabling a wide sampling of surface structures. Applied in an astrophysical context, this study suggests that widening of the dOH feature by adsorption of aromatic molecules could explain its absence heretofore in observational ice spectra, offering hope that future missions with higher sensitivity will verify its presence or absence in dense regions.

Original languageEnglish
Pages (from-to)2994-3001
Number of pages8
JournalJournal of Physical Chemistry C
Volume124
Issue number5
DOIs
StatePublished - Feb 6 2020
Externally publishedYes

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