Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Measurements of trap dynamics of cold OH molecules using resonance
  enhanced multiphoton ionization   Trapping cold, chemically important molecules with electromagnetic fields is
a useful technique to study small molecules and their interactions. Traps
provide long interaction times that are needed to precisely examine these low
density molecular samples. However, the trapping fields lead to non-uniform
molecular density distributions in these systems. Therefore, it is important to
be able to experimentally characterize the spatial density distribution in the
trap. Ionizing molecules in different locations in the trap using resonance
enhanced multiphoton ionization (REMPI) and detecting the resulting ions can be
used to probe the density distribution even with the low density present in
these experiments because of the extremely high efficiency of detection. Until
recently, one of the most chemically important molecules, OH, did not have a
convenient REMPI scheme. Here, we use a newly developed 1 + 1' REMPI scheme to
detect trapped cold OH molecules. We use this capability to measure trap
dynamics of the central density of the cloud and the density distribution.
These types of measurements can be used to optimize loading of molecules into
traps, as well as to help characterize the energy distribution, which is
critical knowledge for interpreting molecular collision experiments.

32
The categories of this paper are: atom-ph
5
The categories of this paper are: gr-qc
14
The categories of this paper are: math-ph
33
The categories of this paper are: plasm-ph
9
The categories of this paper are: nlin
17
The categories of this paper are: q-fin
15
The categories of this paper are: nucl-ex
24
The categories of this paper are: dg-ga
29
The categories of this paper are: funct-an
30
The categories of this paper are: q-alg
11
The categories of this paper are: hep-lat
31
The categories of this paper are: ao-sci
10
The categories of this paper are: q-bio
36
The categories of this paper are: cmp-lg
23
The categories of this paper are: solv-int
7
The categories of this paper are: hep-th