Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Optical pumping and relaxation of atomic population in assorted
  conditions   The precise control and knowledge over the atomic dynamics is central to the
advancement of quantum technology. The different experimental conditions
namely, atoms in a vacuum, an anti-relaxation coated and a buffer gas filled
atomic cell provides complementary platform for such investigations. The extent
of changes in optical pumping, velocity changing collision and hyperfine
changing collision rates associated with these conditions are discussed. There
is a phenomenal change in the optical density by a factor of >25 times in
presence of a control field in buffer gas environment. In contrary to earlier
reports, we found confinement induced enhanced optical pumping as the mechanism
behind the observed transparency in buffer gas cell. The feeble interplay of
radiation trapping under specific conditions are pointed out. The diffusive
velocity of atoms is measured to be ~25+-12 m/s and <= 8+-4 m/s for
anti-relaxation coated and buffer gas filled cell respectively. The studies
will have useful application in measurements of relaxation rates, quantum
memory, quantum repeaters and atomic devices.

32
The categories of this paper are: atom-ph
8
The categories of this paper are: hep-ex
16
The categories of this paper are: stat
22
The categories of this paper are: chao-dyn
9
The categories of this paper are: nlin
24
The categories of this paper are: dg-ga
1
The categories of this paper are: cs
36
The categories of this paper are: cmp-lg
25
The categories of this paper are: patt-sol
6
The categories of this paper are: astro-ph
19
The categories of this paper are: eess
11
The categories of this paper are: hep-lat
13
The categories of this paper are: quant-ph
23
The categories of this paper are: solv-int
31
The categories of this paper are: ao-sci
33
The categories of this paper are: plasm-ph