Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Crystal Growth in the Presence of Surface Melting: Novel Behavior of the
  Principal Facets of Ice   We present measurements of the growth rates of the principal facet surfaces
of ice from water vapor as a function of supersaturation over the temperature
range -2 C > T > -40 C. Our data are well described by a dislocation-free
layer-nucleation model, parameterized by the attachment coefficient as a
function of supersaturation \alpha(\sigma) = Aexp(-\sigma_0/\sigma). The
measured parameters A(T) and \sigma_0(T) for the basal and prism facets exhibit
a complex behavior that likely originates from structural changes in the ice
surface with temperature, in particular the onset and development of surface
melting for T > -15 C. From \sigma_0(T) we extract the terrace step energy
\beta(T) as a function of temperature for both facet surfaces. As a basic
property of the equilibrium ice surface, the step energy \beta(T) may be
amenable to calculation using molecular dynamics simulations, potentially
yielding new insights into the enigmatic surface structure of ice near the
triple point.

13
The categories of this paper are: quant-ph
21
The categories of this paper are: adap-org
28
The categories of this paper are: alg-geom
33
The categories of this paper are: plasm-ph
5
The categories of this paper are: gr-qc
25
The categories of this paper are: patt-sol
32
The categories of this paper are: atom-ph
15
The categories of this paper are: nucl-ex
1
The categories of this paper are: cs
17
The categories of this paper are: q-fin
9
The categories of this paper are: nlin
10
The categories of this paper are: q-bio
7
The categories of this paper are: hep-th
27
The categories of this paper are: comp-gas
36
The categories of this paper are: cmp-lg
18
The categories of this paper are: econ