Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Spectroscopy of high pressure rubidium-noble gas mixtures   Spectroscopy of alkali-buffer gas mixtures at high pressures from
single-digit to several 100 bars in the regime of substantial collisional
broadening is relevant in a wide range of fields, ranging from collisional
redistribution cooling to laboratory astrophysics. Here we report on
spectroscopic measurements of dense rubidium-noble gas mixtures recorded in a
pressure cell equipped with soldered sapphire optical viewports, which allows
for the controlled realization of extreme conditions of high temperature and
high pressure in a table top laboratory experiment. In the gas cell, we have
recorded absorption and emission spectra of rubidium subject to 250 bar helium
buffer gas pressure at 500 K temperature. The spectra to good accuracy fulfill
the thermodynamic Kennard- Stepanov frequency scaling of the ratio of
absorption and emission spectral profiles. Further, the long optical path
length in the cell allowed to both record spectra of rubidium-argon mixtures at
moderate temperatures and high pressures and to observe redistributional laser
cooling in this system.

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The categories of this paper are: nlin
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The categories of this paper are: bayes-an
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The categories of this paper are: math
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The categories of this paper are: solv-int
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The categories of this paper are: hep-lat
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The categories of this paper are: math-ph
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The categories of this paper are: q-bio
12
The categories of this paper are: nucl-th
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The categories of this paper are: stat
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The categories of this paper are: chao-dyn
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The categories of this paper are: q-alg
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The categories of this paper are: acc-phys
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The categories of this paper are: funct-an
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The categories of this paper are: comp-gas
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The categories of this paper are: mtrl-th
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The categories of this paper are: quant-ph