Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: First-principles study on field evaporation of surface atoms from W(011)
  and Mo(011) surfaces   The simulations of field-evaporation processes for surface atoms on W(011)
and Mo(011) surfaces are implemented using first-principles calculations based
on the real-space finite-difference method. The threshold values of the
external electric field for evaporation of the surface atoms, which are $\sim$
6 V/\AA 2mm for tungsten and $\sim$ 5 V/\AA 2mm for molybdenum, are in
agreement with the experimental results. Whereas field evaporation has been
believed to occur as a result of significant local-field enhancement around the
evaporating atoms, in this study, the enhancement is not observed around the
atoms but above them and the strength of the local field is much smaller than
that expected on the basis of the classical model.

31
The categories of this paper are: ao-sci
16
The categories of this paper are: stat
5
The categories of this paper are: gr-qc
37
The categories of this paper are: supr-con
26
The categories of this paper are: bayes-an
7
The categories of this paper are: hep-th
36
The categories of this paper are: cmp-lg
32
The categories of this paper are: atom-ph
25
The categories of this paper are: patt-sol
34
The categories of this paper are: chem-ph
15
The categories of this paper are: nucl-ex
11
The categories of this paper are: hep-lat
6
The categories of this paper are: astro-ph
19
The categories of this paper are: eess
1
The categories of this paper are: cs
18
The categories of this paper are: econ