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Merck
  • Tracking ultrafast excited-state bond-twisting motion in solution close to the Franck-Condon point.

Tracking ultrafast excited-state bond-twisting motion in solution close to the Franck-Condon point.

The journal of physical chemistry. B (2007-05-08)
Benjamin Dietzek, Torbjörn Pascher, Arkady Yartsev
摘要

Applying optimal control to photoinduced trans-cis isomerization in condensed phase, the dynamics of bond-twisting motion of 1,1'-diethyl-4,4'-cyanine in methanol and propanol is revealed. The shape of the optimized pulse resulting from minimization of the photoisomer formation can be directly related to the initial excited-state dynamics in close proximity to the Franck-Condon point. The solvent viscosity-dependent ultrafast wavepacket motion is reflected in the prominent down-chirp of the optimized pulses and reveals a detailed picture of the control mechanism: The reduction of the isomer production is achieved by most efficient dumping of excited population back to the trans ground state. In the higher-viscosity solvent, propanol, wavelength-dependent oscillatory features are superimposed to the overall chirp structure pointing to the importance of excited-state vibrational coherences for the dumping process.

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Sigma-Aldrich
1,1'-二乙基-4,4'-羰花青碘, 96%