title: Dynamics of intermolecular interactions in CCl4via the isotope effect by femtosecond time-resolved spectroscopy.
abstract: We report our study on the ultrafast dynamics of intermolecular interactions in liquid CCl4. A transient transmission time domain signal, obtained in the 40 ps delay range, exhibits beating at the difference frequency of the totally symmetric stretching vibrations of the tetrachloride isotopologues. We show that the spectra obtained as the windowed Fourier transform of different parts of the time domain signal in the range of this totally symmetric vibration, split due to the isotope effect, carry the information about the dynamics of the coherently excited, coupled molecules. We use a simple theoretical model in order to prove that the intermolecular interaction influences the relative amplitudes of the isotopologue peaks in the spectrum. Moreover, we demonstrate that the pump induced coherence in the system leads to additional strengthening of the interaction, which can be observed in the spectra obtained from the experimental time domain signal.
authors.affiliation: Laboratory of Physicochemistry of Dielectrics and Magnetics, Department of Chemistry, University of Warsaw, ul. Żwirki I Wigury 101, 02-089 Warsaw, Poland. bogad@chem.uw.edu.pl.
authors.forename: Jadwiga
authors.initials: J
authors.lastname: Konarska
authors.forename: Wojciech
authors.initials: W
authors.lastname: Gadomski
authors.forename: Bożena
authors.initials: B
authors.lastname: Ratajska-Gadomska
authors.forename: Kamil
authors.initials: K
authors.lastname: Polok
authors.forename: Grzegorz
authors.initials: G
authors.lastname: Pudłowski
authors.forename: Tomasz M
authors.initials: TM
authors.lastname: Kardaś