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The structure of laser excited molecules in solution studied by Time Resolved X-ray Diffraction

Abstract : In this thesis we investigate the reaction dynamics of photo-excited Br2 in CCl4, HgI2 and HgBr2 in CH3OH.
We show how it is experimentally possible, by means of Time Resolved X-ray Diffraction, to identify the transient molecular structures formed in solution after the ultrafast laser excitation of the solute molecules and follow in time their rearrangements with a resolution of 100ps. We are able to discriminate the main relaxation and recombination pathways of the reactions, which in liquid phase is determined by the solvent environment: the information contained in the diffraction patterns allows us also to study the solvent response to the heating induced during the solute rearrangements.
Supporting the Time Resolved data with Molecular Dynamics simulations, static diffraction data and the experimental study of the pure solvent response to ultrafast heating, the comprehensive reaction dynamics of the molecules in solution spanning from ps up to mus is reconstructed.
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Contributor : Manuela Lo Russo <>
Submitted on : Monday, July 16, 2007 - 2:00:31 PM
Last modification on : Monday, July 16, 2007 - 3:35:58 PM
Long-term archiving on: : Thursday, April 8, 2010 - 11:19:08 PM


  • HAL Id : tel-00162897, version 1




Manuela Lo Russo. The structure of laser excited molecules in solution studied by Time Resolved X-ray Diffraction. Physics [physics]. Université Joseph-Fourier - Grenoble I, 2007. English. ⟨tel-00162897⟩



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