Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Spin-state-controlled chemi-ionization reactions between metastable
  helium atoms and ground-state lithium atoms   We demonstrate the control of $^4$He(2$^3$S$_1$)-$^7$Li(2$^2$S$_{1/2}$)
chemi-ionization reactions by all-optical electron-spin-state preparation of
both atomic species prior to the collision process. Our results demonstrate
that chemi-ionization is strongly suppressed (enhanced) for non-spin-conserving
(spin-conserving) collisions at thermal energies. These findings are in good
agreement with a model based on spin angular momentum coupling of the prepared
atomic states to the quasi-molecular states. Small deviations from the model
indicate the contribution of the $^4\Sigma^+$ channel to the reaction rate
which is in violation of spin conservation.

18
The categories of this paper are: econ
24
The categories of this paper are: dg-ga
20
The categories of this paper are: acc-phys
34
The categories of this paper are: chem-ph
8
The categories of this paper are: hep-ex
31
The categories of this paper are: ao-sci
10
The categories of this paper are: q-bio
23
The categories of this paper are: solv-int
15
The categories of this paper are: nucl-ex
0
The categories of this paper are: hep-ph
37
The categories of this paper are: supr-con
28
The categories of this paper are: alg-geom
26
The categories of this paper are: bayes-an
14
The categories of this paper are: math-ph
17
The categories of this paper are: q-fin
36
The categories of this paper are: cmp-lg