Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Spectra of Radiation Emitted from Open-Ended and Closed Carbon Nanotubes
  Exposed to Microwave Fields   We performed experiments in which both open-ended and closed carbon nanotubes
were exposed to 2.46 GHz microwaves over the course of several irradiation and
cooling cycles at a pressure of ~10-6 torr. The spectra of the radiation
emitted from the nanotubes indicate that the intensity of the emitted radiation
with wavelengths of 650-1000 nm increased during the irradiation cycles.
However, the intensity of the radiation emitted from untreated nanotubes
increased substantially more than the intensity of the radiation emitted from
nanotubes that had been chemically treated in order to open nanotube ends. As
open-ended nanotubes have a lower work function than closed nanotubes, and as
nanotube ends are known to open as they are heated, our results suggest that
the mechanism responsible for the emission of infrared, visible, and
ultra-violet radiation from carbon nanotubes exposed to microwaves is field
emission-induced luminescence.

22
The categories of this paper are: chao-dyn
31
The categories of this paper are: ao-sci
3
The categories of this paper are: physics
29
The categories of this paper are: funct-an
8
The categories of this paper are: hep-ex
27
The categories of this paper are: comp-gas
1
The categories of this paper are: cs
18
The categories of this paper are: econ
15
The categories of this paper are: nucl-ex
26
The categories of this paper are: bayes-an
19
The categories of this paper are: eess
7
The categories of this paper are: hep-th
34
The categories of this paper are: chem-ph
2
The categories of this paper are: math
13
The categories of this paper are: quant-ph
0
The categories of this paper are: hep-ph