@unpublished{FerschMalyRueheetal.2023,
  author    = {Fersch, Daniel and Mal{\´y}, Pavel and R{\"u}he, Jessica and Lisinetskii, Victor and Hensen, Matthias and W{\"u}rthner, Frank and Brixner, Tobias},
  title     = {Single-Molecule Ultrafast Fluorescence-Detected Pump-Probe Microscopy},
  doi       = {10.25972/OPUS-31348},
  url       = {http://nbn-resolving.de/urn:nbn:de:bvb:20-opus-313485},
  year      = {2023},
  abstract  = {We introduce fluorescence-detected pump-probe microscopy by combining a wavelength-tunable ultrafast laser with a confocal scanning fluorescence microscope, enabling access to the femtosecond time scale on the micrometer spatial scale. In addition, we obtain spectral information from Fourier transformation over excitation pulse-pair time delays. We demonstrate this new approach on a model system of a terrylene bisimide (TBI) dye embedded in a PMMA matrix and acquire the linear excitation spectrum as well as time-dependent pump-probe spectra simultaneously. We then push the technique towards single TBI molecules and analyze the statistical distribution of their excitation spectra. Furthermore, we demonstrate the ultrafast transient evolution of several individual molecules, highlighting their different behavior in contrast to the ensemble due to their individual local environment. By correlating the linear and nonlinear spectra, we assess the effect of the molecular environment on the excited-state energy.},
  subject      = {Fluoreszenz},
  language  = {en}
}
@unpublished{DietzschJayachandranMuelleretal.2023,
  author    = {Dietzsch, Julia and Jayachandran, Ajay and Mueller, Stefan and H{\"o}bartner, Claudia and Brixner, Tobias},
  title     = {Excitonic coupling of RNA-templated merocyanine dimer studied by higher-order transient absorption spectroscopy},
  series = {Chemical Communications},
  journal   = {Chemical Communications},
  edition   = {submitted version},
  doi       = {10.1039/D3CC02024J},
  url       = {http://nbn-resolving.de/urn:nbn:de:bvb:20-opus-327772},
  year      = {2023},
  abstract  = {We report the synthesis and spectroscopic analysis of RNA containing the barbituric acid merocyanine rBAM2 as a nucleobase surrogate. Incorporation into RNA strands by solid-phase synthesis leads to fluorescence enhancement compared to the free chromophore. In addition, linear absorption studies show the formation of an excitonically coupled H-type dimer in the hybridized duplex. Ultrafast third- and fifth-order transient absorption spectroscopy of this non-fluorescent dimer suggests immediate (sub-200 fs) exciton transfer and annihilation due to the proximity of the rBAM2 units.},
  language  = {en}
}