Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Molecular Dynamics Simulations of Field Emission From a Prolate
  Spheroidal Tip   High resolution molecular dynamics simulations with full Coulomb interactions
of electrons are used to investigate field emission from a prolate spheroidal
tip. The space charge limited current is several times lower than the current
calculated with the Fowler-Nordheim formula. The image-charge is taken into
account with a spherical approximation, which is good around the top of the
tip, i.e. region where the current is generated.

6
The categories of this paper are: astro-ph
9
The categories of this paper are: nlin
0
The categories of this paper are: hep-ph
34
The categories of this paper are: chem-ph
1
The categories of this paper are: cs
30
The categories of this paper are: q-alg
22
The categories of this paper are: chao-dyn
25
The categories of this paper are: patt-sol
23
The categories of this paper are: solv-int
11
The categories of this paper are: hep-lat
13
The categories of this paper are: quant-ph
16
The categories of this paper are: stat
27
The categories of this paper are: comp-gas
12
The categories of this paper are: nucl-th
35
The categories of this paper are: mtrl-th
10
The categories of this paper are: q-bio