Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Beyond Vibrationally Mediated Electron Transfer: Coherent Phenomena
  Induced by Ultrafast Charge Separation   Wave packet propagation succeeding electron transfer (ET) from alizarin dye
molecules into the nanocrystalline TiO2 semiconductor has been studied by
ultrafast transient absorption spectroscopy. Due to the ultrafast time scale of
the ET reaction of about 6 fs the system shows substantial differences to
molecular ET systems. We show that the ET process is not mediated by molecular
vibrations and therefore classical ET theories lose their applicability. Here
the ET reaction itself prepares a vibrational wave packet and not the
electromagnetic excitation by the laser pulse. Furthermore, the generation of
phonons during polaron formation in the TiO2 lattice is observed in real time
for this system. The presented investigations enable an unambiguous assignment
of the involved photoinduced mechanisms and can contribute to a corresponding
extension of molecular ET theories to ultrafast ET systems like alizarin/TiO2.

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The categories of this paper are: hep-th
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The categories of this paper are: hep-lat
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The categories of this paper are: astro-ph
35
The categories of this paper are: mtrl-th
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The categories of this paper are: cs
36
The categories of this paper are: cmp-lg
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The categories of this paper are: adap-org
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The categories of this paper are: eess
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The categories of this paper are: nucl-th
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The categories of this paper are: alg-geom
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The categories of this paper are: q-fin
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The categories of this paper are: hep-ex
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The categories of this paper are: econ
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The categories of this paper are: funct-an
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The categories of this paper are: math
0
The categories of this paper are: hep-ph