Title :
Molecular dynamics in liquids from femtosecond time-resolved impulsive stimulated scattering
Author :
Ruhman, Sanford ; Kohler, Bern ; Joly, Alan G. ; Nelson, Keith A.
Author_Institution :
Dept. of Chem., MIT, Cambridge, MA, USA
Abstract :
Molecular motions in simple liquids are observed on the femtosecond time scale by means of impulsive simulated scattering. In carbon disulphide and benzene liquids, weakly oscillatory time-dependent responses are observed. These are interpreted in terms of molecular orientational motion which at short times is vibrational (i.e. librational) in character due to intermolecular interactions. In CS/sub 2/, the dephasing of the oscillations is primarily inhomogeneous. Temperature-dependent values of the configuration-averaged librational frequency and the extent of its inhomogeneity are determined.<>
Keywords :
carbon compounds; intermolecular forces; liquids; organic compounds; stimulated Raman scattering; time resolved spectroscopy; vibrational states in disordered systems; CS/sub 2/; benzene liquids; femtosecond time-resolved impulsive stimulated scattering; intermolecular interactions; librational character; librational frequency; molecular dynamics; molecular orientational motion; oscillatory time-dependent responses; simple liquids; vibrational character; Fluid dynamics; Frequency; Light scattering; Liquids; Nearest neighbor searches; Optical scattering; Raman scattering; Rayleigh scattering; Time domain analysis;
Journal_Title :
Quantum Electronics, IEEE Journal of
