9 research outputs found
Simulating the Ultrafast Excited State Dynamics of Cyclopentadiene and 1,2,3,4-tetramethylcyclopentadiene
Back Cover: Pulling the Levers of Photophysics: How Structure Controls the Rate of Energy Dissipation
Tuning and Tracking of Coherent Shear Waves in Molecular Films
We have determined the time-dependent
displacement fields in molecular sub-micrometer thin films as response
to femtosecond and picosecond laser pulse heating by time-resolved
X-ray diffraction. This method allows a direct absolute determination
of the molecular displacements induced by electron–phonon interactions,
which are crucial for, for example, charge transport in organic electronic
devices. We demonstrate that two different modes of coherent shear
motion can be photoexcited in a thin film of organic molecules by
careful tuning of the laser penetration depth relative to the thickness
of the film. The measured response of the organic film to impulse
heating is explained by a thermoelastic model and reveals the spatially
resolved displacement in the film. Thereby, information about the
profile of the energy deposition in the film as well as about the
mechanical interaction with the substrate material is obtained
Coherent motion reveals non-ergodic nature of internal conversion between excited states
Charge-resonance excitations in symmetric molecules - Comparison of linear response DFT with CC3 for the excited states of a model dimer
Alfred Werner: The well-coordinated chemist
Alfred Werner’s careful experiments led to the discovery of what came to be known as coordination bonds. Mike Sutton looks at how he pointed the way to chemistry’s complex future