Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Quantum diffusion at high interstitial concentrations: Application to
  surface diffusion   In this work we first study the quantum diffusion in a volume of a
crystalline solid at high interstitial concentrations when the effects of the
short-range interactions between the diffusing particles are to be factors.
Within the scope of the small-polaron formalism the transition rate depending
on both the temperature and the interstitial concentration has been calculated.
Then, using the obtained result, we consider the model of surface diffusion
that reproduces qualitatively the diffusion behaviour of the hydrogen isotopes
on W(110) surface, observed in the lowtemperature experiments [S.C. Wang and R.
Gomer, J.Chem.Phys. v.83, 4193 (1985)]. The coverage dependence of the
diffusion coefficient is determined by Monte Carlo simulation. The model allows
to suppose that substantially the different diffusion of hydrogen (tritium) and
deuterium can be the outcome of their different quantum statistic and the
direct interactions between the adparticles.

37
The categories of this paper are: supr-con
11
The categories of this paper are: hep-lat
32
The categories of this paper are: atom-ph
7
The categories of this paper are: hep-th
13
The categories of this paper are: quant-ph
24
The categories of this paper are: dg-ga
5
The categories of this paper are: gr-qc
23
The categories of this paper are: solv-int
6
The categories of this paper are: astro-ph
34
The categories of this paper are: chem-ph
28
The categories of this paper are: alg-geom
22
The categories of this paper are: chao-dyn
2
The categories of this paper are: math
10
The categories of this paper are: q-bio
15
The categories of this paper are: nucl-ex
29
The categories of this paper are: funct-an