https://dx.doi.org/10.1039/C7CP04999D">
 

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Abstract

Mass spectra of helium nanodroplets doped with H2 and coronene feature anomalies in the ion abundance that reveal anomalies in the energetics of adsorption sites. The coronene monomer ion strongly adsorbs up to n = 38 H2 molecules indicating a commensurate solvation shell that preserves the D6h symmetry of the substrate. No such feature is seen in the abundance of the coronene dimer through tetramer complexed with H2; this observation rules out a vertical columnar structure. Instead we see evidence for a columnar structure in which adjacent coronenes are displaced in parallel, forming terraces that offer additional strong adsorption sites. The experimental value for the number of adsorption sites per terrace, approximately six, barely depends on the number of coronene molecules. The displacement estimated from this number exceeds the value reported in several theoretical studies of the bare, neutral coronene dimer.

Department

Physics

Publication Date

10-12-2017

Journal Title

Physical Chemistry Chemical Physics

Publisher

Royal Society of Chemistry

Digital Object Identifier (DOI)

https://dx.doi.org/10.1039/C7CP04999D

Document Type

Article

Comments

This is an article published by Royal Society of Chemistry in Physical Chemistry Chemical Physics in 2017, available online: https://dx.doi.org/10.1039/C7CP04999D

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