Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Formation of negative hydrogen ions in 7-keV OH+ + Ar and OH+ + acetone
  collisions: a general process for H-bearing molecular species   We demonstrate that the formation of negative hydrogen ions (H-) occurs in a
wide class of atomic and molecular collisions. In our experiments, H- emission
from hydroxyl cations and acetone molecules was observed in keV-energy
collisions. We show that hydride (H-) anions are formed via direct collisional
fragmentation of molecules, followed by electron grabbing by fast hydrogen
fragments. Such general mechanism in hydrogen-containing molecules may
significantly influence reaction networks in planetary atmospheres and
astrophysical media and new reaction pathways may have to be added in
radiolysis studies.

22
The categories of this paper are: chao-dyn
10
The categories of this paper are: q-bio
31
The categories of this paper are: ao-sci
8
The categories of this paper are: hep-ex
14
The categories of this paper are: math-ph
36
The categories of this paper are: cmp-lg
13
The categories of this paper are: quant-ph
25
The categories of this paper are: patt-sol
19
The categories of this paper are: eess
7
The categories of this paper are: hep-th
32
The categories of this paper are: atom-ph
28
The categories of this paper are: alg-geom
6
The categories of this paper are: astro-ph
2
The categories of this paper are: math
27
The categories of this paper are: comp-gas
18
The categories of this paper are: econ