Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Site-specific Interrogation of an Ionic Chiral Fragment During
  Photolysis Using an X-ray Free-Electron Laser   Short-wavelength free-electron lasers with their ultrashort pulses at high
intensities have originated new approaches for tracking molecular dynamics from
the vista of specific sites. X-ray pump X-ray probe schemes even allow to
address individual atomic constituents with a 'trigger'-event that preludes the
subsequent molecular dynamics while being able to selectively probe the
evolving structure with a time-delayed second X-ray pulse. Here, we use a
linearly polarized X-ray photon to trigger the photolysis of a prototypical
chiral molecule, namely trifluoromethyloxirane (C$_3$H$_3$F$_3$O), at the
fluorine K-edge at around 700 eV. The evolving fluorine-containing fragments
are then probed by a second, circularly polarized X-ray pulse of higher photon
energy in order to investigate the chemically shifted inner-shell electrons of
the ionic motherfragment for their stereochemical sensitivity. We
experimentally demonstrate and theoretically support how two-color X-ray pump
X-ray probe experiments with polarization control enable XFELs as tools for
chiral recognition.

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The categories of this paper are: funct-an
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The categories of this paper are: acc-phys
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The categories of this paper are: atom-ph
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The categories of this paper are: nucl-ex
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The categories of this paper are: cmp-lg
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The categories of this paper are: econ
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The categories of this paper are: alg-geom
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The categories of this paper are: stat
8
The categories of this paper are: hep-ex
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The categories of this paper are: chem-ph
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The categories of this paper are: ao-sci
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The categories of this paper are: mtrl-th
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The categories of this paper are: dg-ga
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The categories of this paper are: math-ph
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The categories of this paper are: supr-con
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The categories of this paper are: comp-gas