Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Photoassociation of spin polarized Chromium   We report the homonuclear photoassociation (PA) of ultracold
${}^{52}\mathrm{Cr}$ atoms in an optical dipole trap. This constitutes the
first measurement of PA in an element with total electron spin $\tilde{S}>1$.
Although Cr, with its ${}^{7}\mathrm{S}_{3}$ ground and
${}^{7}\mathrm{P}_{4,3,2}$ excited states, is expected to have a complicated PA
spectrum we show that a spin polarized cloud exhibits a remarkably simple PA
spectrum when circularly polarized light is applied. Over a scan range of 20
GHz below the ${}^{7}\mathrm{P}_{3}$ asymptote we observe two distinct
vibrational series each following a LeRoy-Bernstein law for a $C_3 / R^{3}$
potential with excellent agreement. We determine the $C_3$ coefficients of the
Hund's case c) relativistic adiabatic potentials to be -1.83$\pm$0.02 a.u. and
-1.46$\pm$0.01a.u.. Theoretical non-rotating Movre-Pichler calculations enable
a first assignment of the series to $\Omega=6_u$ and $5_g$ potential energy
curves. In a different set of experiments we disturb the selection rules by a
transverse magnetic field which leads to additional PA series.

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The categories of this paper are: mtrl-th
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The categories of this paper are: cmp-lg
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The categories of this paper are: plasm-ph
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The categories of this paper are: math-ph
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The categories of this paper are: chao-dyn
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The categories of this paper are: hep-th
1
The categories of this paper are: cs
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The categories of this paper are: econ
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The categories of this paper are: adap-org
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The categories of this paper are: solv-int
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The categories of this paper are: acc-phys
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The categories of this paper are: ao-sci
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The categories of this paper are: gr-qc
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The categories of this paper are: patt-sol
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The categories of this paper are: q-bio
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The categories of this paper are: dg-ga