Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Scanning Near-Field Optical Coherent Spectroscopy of Single Molecules at
  1.4 Kelvin   We present scanning near-field extinction spectra of single molecules
embedded in a solid matrix. By varying the molecule-tip separation, we modify
the line shape of the spectra, demonstrating the coherent nature of the
interaction between the incident laser light and the excited state of the
molecule. We compare the measured data with the outcome of numerical
calculations and find a very good agreement.

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The categories of this paper are: patt-sol
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The categories of this paper are: q-fin
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The categories of this paper are: funct-an
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The categories of this paper are: alg-geom
11
The categories of this paper are: hep-lat
9
The categories of this paper are: nlin
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The categories of this paper are: math-ph
31
The categories of this paper are: ao-sci
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The categories of this paper are: dg-ga
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The categories of this paper are: comp-gas
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The categories of this paper are: quant-ph
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The categories of this paper are: chao-dyn
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The categories of this paper are: plasm-ph
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The categories of this paper are: supr-con
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The categories of this paper are: nucl-ex
6
The categories of this paper are: astro-ph