Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Optical Manipulation of Long-range Interactions at the 3s+3p Asymptote
  of Na$_2$   We investigate the influence of a laser field, which is near-resonant to the
atomic sodium 3$^2$P$_{1/2}$ $\to$ 3$^2$D$_{3/2}$ transition, on the last bound
levels of the A$^1\Sigma^+_u$ state in Na$_2$. In a molecular beam experiment
level shifts up to $\approx$ 100 MHz and light induced line broadenings were
observed using an optical double resonance excitation scheme. Moreover, the
coupling laser can reduce the number of bound levels of the A state by one or
more units, which effectively means that in the picture of a collision of a
3$^2$S$_{1/2}$ and a 3$^2$P$_{1/2}$-atom the scattering phase is altered by
more than $\pi$. The observed effects are interpreted as light induced
couplings of the A$^1\Sigma^+_u$ state, which correlates to the
3s$_{1/2}$+3p$_{1/2}$ asymptote, to the $4^1\Sigma^+_g$ and $2^1\Pi_g$ states
at the 3s$_{1/2}$+3d$_{3/2}$ asymptote. We performed multi-channel
calculations, applying the mapped Fourier grid method, which reproduce our
experimentally observed level shifts well.

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The categories of this paper are: astro-ph
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The categories of this paper are: dg-ga
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The categories of this paper are: acc-phys
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The categories of this paper are: patt-sol
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The categories of this paper are: math
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The categories of this paper are: gr-qc
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The categories of this paper are: bayes-an
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The categories of this paper are: adap-org
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The categories of this paper are: comp-gas
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The categories of this paper are: q-alg
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The categories of this paper are: alg-geom
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The categories of this paper are: hep-th
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The categories of this paper are: plasm-ph
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The categories of this paper are: hep-lat
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The categories of this paper are: mtrl-th
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The categories of this paper are: q-bio