Comment on "Sticking of Hydrogen on Supported and Suspended Graphene at Low Temperature"

TL;DR

This paper discusses how low-frequency vibrations of graphene reduce the likelihood of hydrogen atoms sticking to it at low energies, highlighting the importance of vibrational effects in adsorption processes.

Contribution

It provides a critical analysis of previous calculations by including the impact of graphene's vibrational fluctuations on hydrogen sticking probability.

Findings

Vibrational fluctuations significantly suppress hydrogen sticking at energies below 15 meV.

Previous models underestimated the sticking probability by neglecting vibrational effects.

The study emphasizes the need to consider vibrational dynamics in adsorption calculations.

Abstract

The sticking probability of cold atomic hydrogen on suspended graphene calculated by Lepetit and Jackson [Phys. Rev. Lett. {\bf 107}, 236102 (2011)] does not include the effect of fluctuations from low-frequency vibrations of graphene. These fluctuations suppress the sticking probability for low incident energies ($\lesssim 15$ meV).