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  • Analytical Chemistry and Spectroscopy  (12)
  • 42.65.Dr  (4)
  • 33.70.Jg  (1)
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  • 1
    Electronic Resource
    Electronic Resource
    Interferometric coherent Raman spectroscopy with incoherent light: Some applications (1994)
    Springer
    Applied physics 59 (1994), S. 377-387 
    Details
    ISSN: 1432-0649
    Keywords: 42.65.Dr ; 33.20.Fb
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The theory of Interferometric Coherent Raman Scattering (ICRS) using “twin” broadband fields has recently been extended to include both resonant and nonresonant contributions to the signal. It is reviewed here. Valid for both ICARS and ICSRS, it is applied to new ICARS experiments on neat toluene and on alcoholic solutions of a methine dye. In each case the damped Rabi Detuning Oscillations (RDO), that are characteristic of ICRS, lead directly to vibrational frequencies and their dephasing times. The theory is also applied as a new way to determine the ratio of the nonresonant to resonant hyperpolarizabilities, accurately for toluene, and approximately for the methine dye solution whose (vibrationally) “nonresonant” contribution is negative.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01081060
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  • 2
    Electronic Resource
    Electronic Resource
    Structural changes in excited states and photoisomers determined by time-resolved Raman scattering (1994)
    Springer
    Applied physics 59 (1994), S. 403-414 
    Details
    ISSN: 1432-0649
    Keywords: 33.20.Fb ; 42.65.Dr
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Molecules in the excited singlet and triplet state and photoproducts occuring after photoisomerization or proton transfer are investigated by time-resolved resonance Raman and resonance CARS spectroscopy with nanosecond time resolution. From the time-resolved spectra information on structures and bond strengths of these short-lived species and on their kinetics are obtained.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01081063
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Dispersion of the third-order susceptibility of a cyanine dye measured by coherent anti-Stokes Raman scattering (1996)
    Springer
    Applied physics 63 (1996), S. 641-647 
    Details
    ISSN: 1432-0649
    Keywords: 42.65.An ; 42.65.Dr ; 42.70.Jk
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The dispersion of the third-order susceptibility of the cyanine dye bis-(dimethylamino)-heptamethinium chloride was measured by Coherent Anti-Stokes Raman Scattering (CARS) over a wide wavelength range from 530 to 830 nm. Large negative values of the real part of the second-order hyperpolarizability are observed. The data are analyzed with the help of theoretical calculations based on a perturbative approach for the nonlinearities. The dispersion behavior of the third-order susceptibility is governed by the resonant enhancement due to vibrational transitions of the first excited electronic state and, to lesser extent, by an electronic two-photon resonance around 600 nm.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01831006
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  • 4
    Electronic Resource
    Electronic Resource
    Dynamics in condensed molecular systems studied by incoherent light (1996)
    Springer
    Applied physics 63 (1996), S. 209-223 
    Details
    ISSN: 1432-0649
    Keywords: 42.65.Dr ; 78.47. + p ; 42.50.Md ; 33.70.Jg
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Applications of incoherent light techniques to time-resolved studies in condensed matter are reviewed. Vibrational dephasing ofβ-carotene and a heptamethine dye was studied by interferometric coherent anti-Stokes Raman scattering in solution revealing dephasing times between 300 fs and 1.1 ps. This technique gives results that are analogos to spectral methods, but vibrational frequencies can be determined more precisely. Electronic dephasing was studied for a variety of dyes. Forced light scattering is used to measure the initial evolution of the lineshape functiong(t) up to about 50 fs. In the lowest order approximation,g(t) =Δ 2 t 2 /2,, the dephasing is characterized by a modulation strengthΔ = 25 to 150 THz depending on the dye, the solvent and its temperature, and the pump laser wavelength. Interestingly, the modulation decreases for heptamethine in the long-wavelength tail of the absorption band. Brillouin scattering gives rise to finite dephasing times of neat solvents in forced light scattering.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01833789
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Isotope effects and H/D scrambling in the fragmentation of labelled propenes (1974)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 9 (1974), S. 555-557 
    Details
    ISSN: 0030-493X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The fragmentation reaction [C3(H,D)6]+· → [C3(H,D)5]+ + (H, D) has been examined in the metastable decomposition region for two pairs of labelled propenes: CH3CD=CH2,CD3CH=CD2 and CD3CH=CH2, CH3CD=CD2. The results indicate that complete hydrogen scrambling occurs in the propene molecular ion prior to fragmentation. The isotope effect kH/kD is in the range 2·1 to 3·3.
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/oms.1210090602
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  • 6
    Electronic Resource
    Electronic Resource
    Investigation of the photoisomerization process of bisdimethylaminoheptamethine by means of time-resolved CARS (1988)
    Chichester [u.a.] : Wiley-Blackwell
    Journal of Raman Spectroscopy 19 (1988), S. 517-522 
    Details
    ISSN: 0377-0486
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Resonance CARS measurements of the photoisomeriztion process of bisdimethylaminoheptamethine under different resonance and excitation conditions are presented and compared with model calculations. A Six-level model - a Rulliere-type model extended by one level - is suggested.
    Additional Material: 11 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jrs.1250190805
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    Paper (German National Licenses)
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  • 7
    Electronic Resource
    Electronic Resource
    Determination of potential curve parameters of excited electronic states of polyatomic molecules by resonance CARS (1988)
    Chichester [u.a.] : Wiley-Blackwell
    Journal of Raman Spectroscopy 19 (1988), S. 353-357 
    Details
    ISSN: 0377-0486
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Resonance CARS line-shape analysis has been applied to determine the parameters of the excited electronic state potential curves of a cyanine dye and its short-lived photoisomers during the process of photoisomerization. For this very complicated situation other methods for the estimation of these values would fail. The origin shift parameters determined are very small and the homogeneous line width is smaller than the line width of the absorption band.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jrs.1250190509
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  • 8
    Electronic Resource
    Electronic Resource
    Comparison of different phase conjugate and backscattering arrangements in non-linear Raman spectroscopy (1990)
    Chichester [u.a.] : Wiley-Blackwell
    Journal of Raman Spectroscopy 21 (1990), S. 835-839 
    Details
    ISSN: 0377-0486
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: A theoretical and experimental comparison of coherent anti-Stokes Raman scattering (CARS) and Raman-induced phase conjugation (RIPC) techniques has been carried out. In most cases the RIPC techniques are much more sensitive than CARS to deviations from the phase-matching conditions, from which it follows that for RIPC much higher accuracy of the alignment and optical homogeneity are necessary. In practice, only one RIPC variant with nearly copropagating pump waves and contrapropagating Stokes waves is applicable to obtain complete spectra. A CARS reflection technique is discussed for the investigation of highly absorbing samples.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jrs.1250211212
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  • 9
    Electronic Resource
    Electronic Resource
    Resonance CARS line shape analysis for a concentration series of a dye solution - a practicable method for the evaluation of third-order susceptibilities (1986)
    Chichester [u.a.] : Wiley-Blackwell
    Journal of Raman Spectroscopy 17 (1986), S. 425-430 
    Details
    ISSN: 0377-0486
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: An extension of the Fleming and Johnson procedure is presented for determining the molecular third-order susceptibility parameters from three characteristic intensities within a CARS line profile (Imax, Imin, Imid). For CARS excitation close to a molecular one-photon resonance, these three intensity values taken from one spectrum do not suffice for the determination of all relevant parameters. A simple procedure is given for overcoming this by combining the information from all the spectra within a concentration series, keeping the frequency of the CARS pump laser fixed. Uncertainty in the measured Imid value is overcome by applying a least-squares fit of the spectra.Results obtained from resonance CARS measurements for Rhodamine 6G in ethanol are given.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jrs.1250170508
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  • 10
    Electronic Resource
    Electronic Resource
    Photoisomerization studies of pinacyanol using nanosecond time-resolved resonance cars (1987)
    Chichester [u.a.] : Wiley-Blackwell
    Journal of Raman Spectroscopy 18 (1987), S. 323-326 
    Details
    ISSN: 0377-0486
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Resonance CARS spectra of the short-lived photoisomer of pinacyanol were obtained. From the CARS line frequencies, intensities, line shapes and depolarization ratios it can be concluded that a cis-isomer rather than a twisted configuration is observed.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jrs.1250180505
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