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  • Analytical Chemistry and Spectroscopy  (3)
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  • 1
    Electronic Resource
    Electronic Resource
    High-precision femtosecond CARS of simple liquids (1990)
    Chichester [u.a.] : Wiley-Blackwell
    Journal of Raman Spectroscopy 21 (1990), S. 857-861 
    Details
    ISSN: 0377-0486
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: A novel non-degenerate CARS spectrometer is described with an 80-fs time resolution, improved measuring accuracy of ca. 1% for the vibrational dephasing time and adjustable frequency positions of the input pulses. Experimental data are reported for CH stretching vibrations of acetone, acetonitrile and bromoform. Negligible inhomogeneous broadening (〈4%) is deduced from the observed exponential decay for the vibrational transitions. The effect of orientational motion on the dephasing observations is discussed.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jrs.1250211215
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  • 2
    Electronic Resource
    Electronic Resource
    Femtosecond three-colour CARS of liquids with magic polarization conditions (1993)
    Chichester [u.a.] : Wiley-Blackwell
    Journal of Raman Spectroscopy 24 (1993), S. 453-458 
    Details
    ISSN: 0377-0486
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: It was shown recently that three scattering mechanisms with different time behaviours can be separated in time-domain CARS simply by varying the polarization of the detected anti-Stokes signal. In an extension of this work, the magic angle 49.1° for the elimination of the resonant-anisotropic contribution was verified experimentally. It was also found that the residual non-resonant scattering component observed at -60° with suppression of the common CARS interaction represents a six-wave mixing process involving the optical Kerr effect. Using the novel polarization techniques the vibrational dynamics of neat dimethyl sulphoxide was studied in the CH stretching region. Evidence is reported for homogeneous broadening of the symmetric mode at 2913 cm-1 and for a doublet splitting of the asymmetric Raman band of the liquid at 2996 cm-1 not resolved in spontaneous Raman spectroscopy.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jrs.1250240712
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  • 3
    Electronic Resource
    Electronic Resource
    Non-exponential dephasing of molecular vibrations in liquids, directly observed by ‘magic’ femtosecond CARSThis paper is dedicated to Professor D. A. Long on the occasion of his 70th birthday. (1995)
    Chichester [u.a.] : Wiley-Blackwell
    Journal of Raman Spectroscopy 26 (1995), S. 835-840 
    Details
    ISSN: 0377-0486
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Using ‘magic’ polarization geometries in time-resolved coherent anti-Stokes Raman spectroscopy, the isotropic (purely vibrational) scattering contribution was investigated. Non-exponential dephasing was observed on the subpicosecond time-scale, described in the Anderson-Kubo formalism by the correlation time τc. Experimental data are reported for the neat liquids CH2BrCl and (CH3)2SO in the CH stretching region. Values of τc = 330 fs and 240 fs, respectively indicate, homogeneous line broadening for the dephasing processes. The time-domain data are supported by a novel analysis of spontaneous Raman data.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jrs.1250260833
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