Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Time-resolved formation of excited atomic and molecular states in
  XUV-induced nanoplasmas in ammonia clusters   High intensity XUV radiation from a free-electron (FEL) was used to create a
nanoplasma inside ammonia clusters with the intent of studying the resulting
electron-ion interactions and their interplay with plasma evolution. In a
plasma-like state, electrons with kinetic energy lower than the local
collective Coulomb potential of the positive ionic core are trapped in the
cluster and take part in secondary processes (e.g. electron-impact
excitation/ionization and electron-ion recombination) which lead to subsequent
excited and neutral molecular fragmentation. Using a time-delayed UV laser, the
dynamics of the excited atomic and molecular states are probed from -0.1 ps to
18 ps. We identify three different phases of molecular fragmentation that are
clearly distinguished by the effect of the probe laser on the ionic and
electronic yield. We propose a simple model to rationalize our data and further
identify two separate channels leading to the formation of excited hydrogen.

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The categories of this paper are: hep-ph
17
The categories of this paper are: q-fin
14
The categories of this paper are: math-ph
19
The categories of this paper are: eess
29
The categories of this paper are: funct-an
32
The categories of this paper are: atom-ph
13
The categories of this paper are: quant-ph
11
The categories of this paper are: hep-lat
24
The categories of this paper are: dg-ga
35
The categories of this paper are: mtrl-th
33
The categories of this paper are: plasm-ph
23
The categories of this paper are: solv-int
9
The categories of this paper are: nlin
22
The categories of this paper are: chao-dyn
18
The categories of this paper are: econ
20
The categories of this paper are: acc-phys