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@ARTICLE{Hallmann:89182,
      author       = {Hallmann, J. and Morgenroth, W. and Paulmann, C. and
                      Davaasambuu, J. and Kong, Q. and Wulff, M. and Techert, S.
                      and DESY},
      title        = {{T}ime-resolved x-ray diffraction of the photochromic
                      alpha-styrylpyrylium {T}rifluoromethanesulfonate crystal
                      films reveals ultrafast structural switching},
      journal      = {Journal of the American Chemical Society},
      volume       = {131},
      issn         = {0002-7863},
      address      = {Washington, DC},
      publisher    = {American Chemical Society},
      reportid     = {PHPPUBDB-17382},
      pages        = {15018-15025},
      year         = {2009},
      note         = {© American Chemical Society},
      abstract     = {The ultrafast structural dynamics of the [2+2]
                      photocycloaddition of alpha-styrylpyrylium
                      trifluoromethanesulfonate (TFMS) has been studied in great
                      detail. During the photoreaction, optical and infrared
                      spectroscopy confirms that crystals of alpha-styrylpyrylium
                      change color. Since the reaction is reversible, it has been
                      suggested to be used as an organic holographic storage
                      device. The present photocrystallographic studies (with high
                      spatial resolution) allow for an electron density analysis
                      of the overall reaction kinetics, revealing the mechanism of
                      bond-breaking and bond-formation. It could furthermore be
                      proved how the reaction is influenced by the rearrangement
                      of the surrounding moieties. Picosecond time-resolved X-ray
                      diffraction studies allow for the monitoring the
                      photoreaction in crystalline thin films under experimental
                      conditions where the transformation times are greatly
                      enhanced. These investigations are discussed in the context
                      of the photocrystallographic results. It has been found that
                      alpha-styrylpyrylium TFMS undergoes an ultrafast
                      photoreaction to the dimer product state and back-reaction
                      to the monomer reactant state which is temperature driven.
                      The present experiments indicate that TFMS reacts on time
                      scales which are the fundamental limiting ones of
                      two-quantum systems and therefore has the potential to be
                      used as an ultrafast organic molecular switcher.},
      keywords     = {Alkanesulfonates: chemistry / Crystallography, X-Ray /
                      Dimerization / Electrons / Photochemical Processes / Pyrans:
                      chemistry / Spectrophotometry, Infrared / Styrenes:
                      chemistry / Temperature / Time Factors / Alkanesulfonates
                      (NLM Chemicals) / Pyrans (NLM Chemicals) / Styrenes (NLM
                      Chemicals) / alpha-styrylpyrylium (NLM Chemicals)},
      cin          = {HASYLAB(-2012) / FS-SCS},
      ddc          = {540},
      cid          = {$I:(DE-H253)HASYLAB_-2012_-20130307$ /
                      I:(DE-H253)FS-SCS-20131031},
      pnm          = {DORIS Beamline D3 (POF1-550) / DORIS Beamline F1
                      (POF1-550)},
      pid          = {G:(DE-H253)POF1-D3-20130405 / G:(DE-H253)POF1-F1-20130405},
      experiment   = {EXP:(DE-H253)D-D3-20150101 / EXP:(DE-H253)D-F1-20150101},
      typ          = {PUB:(DE-HGF)16},
      pubmed       = {pmid:19824735},
      UT           = {WOS:000271271800077},
      doi          = {10.1021/ja905484u},
      url          = {https://bib-pubdb1.desy.de/record/89182},
}