Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The role of charge and proton transfer in fragmentation of
  hydrogen-bonded nanosystems: the breakup of ammonia clusters upon single
  photon multi-ionization   The charge and proton dynamics in hydrogen-bonded networks are investigated
using ammonia as a model system. The fragmentation dynamics of medium-sized
clusters (1-2 nm) upon single photon multi-ionization is studied, by analyzing
the momenta of small ionic fragments. The observed fragmentation pattern of the
doubly- and triply- charged clusters reveals a spatial anisotropy of emission
between fragments (back-to-back). Protonated fragments exhibit a distinct
kinematic correlation, indicating a delay between ionization and fragmentation
(fission). The different kinematics observed for channels containing protonated
and unprotonated species provides possible insights into the prime mechanisms
of charge and proton transfer, as well as proton hopping, in such a nanoscale
system.

30
The categories of this paper are: q-alg
11
The categories of this paper are: hep-lat
33
The categories of this paper are: plasm-ph
36
The categories of this paper are: cmp-lg
13
The categories of this paper are: quant-ph
19
The categories of this paper are: eess
7
The categories of this paper are: hep-th
23
The categories of this paper are: solv-int
24
The categories of this paper are: dg-ga
31
The categories of this paper are: ao-sci
6
The categories of this paper are: astro-ph
1
The categories of this paper are: cs
18
The categories of this paper are: econ
35
The categories of this paper are: mtrl-th
29
The categories of this paper are: funct-an
20
The categories of this paper are: acc-phys