Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Internal state thermometry of cold trapped molecular anions   Photodetachment spectroscopy of OH- and H3O2- anions has been performed in a
cryogenic 22-pole radiofrequency multipole trap. Measurements of the detachment
cross section as a function of laser frequency near threshold have been
analysed. Using this bound-free spectroscopy approach we could demonstrate
rotational and vibrational cooling of the trapped anions by the buffer gas in
the multipole trap. Below 50 K the OH- rotational temperature shows deviations
from the buffer gas temperature, and possible causes for this are discussed.
For H3O2- vibrational cooling of the lowest vibrational quantum states into the
vibrational ground state is observed. Its photodetachment cross section near
threshold is modelled with a Franck-Condon model, with a detachment threshold
that is lower, but still in agreement with the expected threshold for this
system.

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The categories of this paper are: solv-int
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The categories of this paper are: eess
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The categories of this paper are: comp-gas
7
The categories of this paper are: hep-th
2
The categories of this paper are: math
28
The categories of this paper are: alg-geom
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The categories of this paper are: bayes-an
8
The categories of this paper are: hep-ex
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The categories of this paper are: patt-sol
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The categories of this paper are: acc-phys
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The categories of this paper are: stat
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The categories of this paper are: math-ph
6
The categories of this paper are: astro-ph
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The categories of this paper are: nlin
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The categories of this paper are: supr-con
5
The categories of this paper are: gr-qc