Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Intriguing examples of inhomogeneous broadening   Three problems are considered in which inhomogeneous broadening can yield
unusual consequences. One problem involves the energy levels of atoms moving
within nanopores of nearly cylindrical cross section. A second involves atomic
or molecular motion in a quasi-one dimensional interstitial channel within a
bundle of carbon nanotubes. The third problem involves motion within a groove
between two nanotubes at the surface of such a bundle. In each case, the
density of states at low energy is qualitatively different from that occurring
in the perfectly homogeneous case.

8
The categories of this paper are: hep-ex
5
The categories of this paper are: gr-qc
12
The categories of this paper are: nucl-th
2
The categories of this paper are: math
11
The categories of this paper are: hep-lat
7
The categories of this paper are: hep-th
32
The categories of this paper are: atom-ph
26
The categories of this paper are: bayes-an
29
The categories of this paper are: funct-an
6
The categories of this paper are: astro-ph
37
The categories of this paper are: supr-con
28
The categories of this paper are: alg-geom
20
The categories of this paper are: acc-phys
15
The categories of this paper are: nucl-ex
27
The categories of this paper are: comp-gas
19
The categories of this paper are: eess