Journal ArticleDOI
Resonant impulsive-stimulated Raman scattering on malachite green.
J. Chesnoy,A. Mokhtari +1 more
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TLDR
Vibrational quantum beats were observed superimposed on the saturated absorption and dispersion signals and quantitatively explained in terms of impulsive-stimulated Raman scattering close to an electronic resonance.Abstract:
We have studied in the femtosecond regime the transient dynamics of dichroism (anisotropic absorption), birefringence, and frequency shift induced by an intense femtosecond pump beam in the dye malachite green in solution. Vibrational quantum beats were observed superimposed on the saturated absorption and dispersion signals and quantitatively explained in terms of impulsive-stimulated Raman scattering close to an electronic resonance. The selectivity for observation of the vibrations in the two electronic states is described for the different experimental schemes. We discuss the access to vibrational and electronic dynamics in both ground and excited electronic states and compare the possibilities to those of previous techniques.read more
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Journal ArticleDOI
Visualization of coherent nuclear motion in a membrane protein by femtosecond spectroscopy
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Femtosecond Pulse Sequences Used for Optical Manipulation of Molecular Motion
TL;DR: Optical control over elementary molecular motion is enhanced with timed sequences of femtosecond pulses produced by pulse-shaping techniques, analogous to repetitively pushing a child on a swing with appropriate timing to build up a large oscillation amplitude.
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Wave packet theory of dynamic absorption spectra in femtosecond pump–probe experiments
TL;DR: In this article, a perturbative density matrix theory for the third-order susceptibility of a multilevel system is formulated in terms of four-time correlation functions which are interpreted as the timedependent overlap of bra and ket vibrational wave packets propagating independently on the ground and excited electronic state potential surfaces.
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Evolution of the vibronic absorption spectrum in a molecule following impulsive excitation with a 6 fs optical pulse
TL;DR: In this article, a 6 fs optical pulse was used to impulsively excited the entire manifold of Franck-Condon-connected vibronic levels for the S 0 to S 1 transition in an organic dye in solution.
Journal ArticleDOI
Off-resonant transient birefringence in liquids
TL;DR: In this article, off-resonant transient birefringence measurements are analyzed using a reduced equation of motion for the ground state density matrix, which is expanded using an effective Hamiltonian.