  We present a detailed study of the nuclear quantum effects in H/D sticking to
graphene, comparing classical, quantum and mixed quantum/classical simulations
to results of scattering experiments. Agreement with experimentally derived
sticking probabilities is improved when nuclear quantum effects are included
using ring polymer molecular dynamics. Specifically, the quantum motion of the
carbon atoms enhances sticking, showing that an accurate description of
graphene phonons is important to capturing the adsorption dynamics. We also
find an inverse H/D isotope effect arising from Newtonian mechanics.
