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  • 1
    Electronic Resource
    Electronic Resource
    Two-photon resonance degenerate four-wave mixing in a three-level polar molecule (model calculations) (1996)
    Springer
    Optical and quantum electronics 28 (1996), S. 1055-1066 
    Details
    ISSN: 1572-817X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract The third-order non-linear susceptibility, χ(3)(ω; ω, ω, −ω), describing the phase conjugation by degenerate four-wave mixing (DFWM) is calculated for a three-level polar system under a two-photon resonance (TPR) condition. The part of the susceptibility expressed only by the transitional dipole moments and the part resulting from the permanent dipole moments are distinguished. The spectra of χ(3)(ω; ω, ω, −ω), as well as the DFWM power-reflection and power-transmission spectra near to the TPR, are modelled for polar molecules. The effect of enhanced reflectivity of TPR-DFWM is obtained numerically.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00278276
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  • 2
    Electronic Resource
    Electronic Resource
    On the spectra of resonant coherent Raman scattering (1980)
    Springer
    Optical and quantum electronics 12 (1980), S. 315-325 
    Details
    ISSN: 1572-817X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract The spectra of resonant coherent anti-Stokes and Stokes Raman scattering of excited molecules are calculated and discussed. The interaction of light and molecules is treated semi-classically. The energy level diagram of four energy levels describing the process is used in four modifications possible for excited molecules. It is shown that non-vibrational resonances give ‘extra’ maxima in some of the spectra. Comparison of the spectral structure in the Stokes and anti-Stokes components gives information on which of the four schemes the interaction is realized by. The influence of the pumping detuning on the Stokes component shape is pointed out.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00620286
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  • 3
    Electronic Resource
    Electronic Resource
    Optical four-wave mixing in bulk polymers (1992)
    Springer
    Applied physics 55 (1992), S. 373-377 
    Details
    ISSN: 1432-0649
    Keywords: 42.65.Dr
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A multiplex CARS scheme is used to study the bulk polymers poly-(methyl methacrylate) (PMMA) and poly-(vinyl toluene) (PVT). A coherent signal resulting from optical four-wave mixing is obtained with electronic and Raman-resonant parts. The magnitude of the third-order optical susceptibility tensor of these polymers is experimentally estimated. Significant enhancement of the total susceptibility by the Raman resonances is observed for PVT.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00333084
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Some interference effects in resonance coherent Raman spectroscopy (1986)
    Chichester [u.a.] : Wiley-Blackwell
    Journal of Raman Spectroscopy 17 (1986), S. 363-367 
    Details
    ISSN: 0377-0486
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Coherent Raman spectra for resonance pumping conditions and a three-frequency variant were claculated for polyatomic molecules. A model based on density of states and displaced harmonic oscillators was used. The contributions of different intermediate vibrational levels in the electronic state S1 to the resonance Raman susceptiblity χ(3)R(r) and the interference of χ(3)R(r) with a non-resonant electronic background are discussed. It is shown that many intermediate levels belonging to S1 and corresponding to two excited vibrations (the relevant Raman vibration and either one of the others) influence the spectrum significantly, in contrast to the case with absorption. The asymmetry of the Raman line is due mainly to the interference with a non-resonant background. The method used takes into account the influence of the interference of neighbouring lines on the line shape and also the possible deformation of the lines by the dispersion of the Raman polarizability. The results are in qualitative agreement with known experimental data for some dyes.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jrs.1250170413
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  • 5
    Electronic Resource
    Electronic Resource
    Some model calculations of the resonance background in coherent Raman spectra (1987)
    Chichester [u.a.] : Wiley-Blackwell
    Journal of Raman Spectroscopy 18 (1987), S. 435-442 
    Details
    ISSN: 0377-0486
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Model calculations of coherent Raman spectra under resonance pumping conditions for polyatomic molecules have been carried out. The influence of the resonance background, which originates from the ‘extra’ resonance term of the resonance vibronic transition S0—S1, is demonstrated. According to the calculations, the coherent anti-Stokes Raman scattering (CARS) spectra for ωa = 2ωp-ωs are slightly changed when the resonance background is taken into account. The background contribution to the coherent Stokes Raman scattering (CSRS) for ωs = 2ωp-ωa is higher. It is shown that a line reshaping associated with the concentration changes contains information about the relaxation parameters of the molecules, especially about the dephasing Γijdep.
    Additional Material: 10 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jrs.1250180611
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  • 6
    Electronic Resource
    Electronic Resource
    Modelling of absorption and non-linear vibronic spectra of polyatomic molecules (1989)
    Chichester [u.a.] : Wiley-Blackwell
    Journal of Raman Spectroscopy 20 (1989), S. 183-189 
    Details
    ISSN: 0377-0486
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Model calculations of the absorption and the four quantities representing third-order non-linear susceptibility [the real and imaginary part of the excitation profile and of the resonance background component for resonance coherent anti-Stokes Raman scattering (CARS), R, J, b′ and b″, respectively] were carried out for polyatomic molecules. Comparison with previously acquired experimental data for bisdimethylaminoheptamethine perchlorate shows satisfactory agreement, except for b′ and b″. Some molecular parameters (the shift parameter of the active vibrations and the vibronic relaxation constant) were estimated. It is concluded that the resonance background is more sensitive to the model than the absorption and the excitation profile.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jrs.1250200310
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  • 7
    Electronic Resource
    Electronic Resource
    Resonance Raman four-wave mixing in molecular systems (1994)
    Chichester [u.a.] : Wiley-Blackwell
    Journal of Raman Spectroscopy 25 (1994), S. 409-413 
    Details
    ISSN: 0377-0486
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Non-linear vibronic spectra of molecules in solution were considered. Probe profiles (PP) of CARS with three laser frequencies, treated as Raman four-wave mixing (Raman FWM), were calculated and compared with excitation profiles (EP) of CARS and of spontaneous Raman scattering. It is demonstrated that the PP of Raman FWM is a characteristic that can be used instead of the EP of spontaneous Raman scattering. The dependence of the lineshape for Raman FWM was modelled. The advantages of Raman FWM are mentioned. In contrast to CARS with two lasers, it is easy to penetrate the high-wavenumber side of the vibronic spectra and to avoid a significant absorption at the exciting wavenumbers.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jrs.1250250606
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  • 8
    Electronic Resource
    Electronic Resource
    Investigations of vibronic transitions by resonance CARS (1990)
    Chichester [u.a.] : Wiley-Blackwell
    Journal of Raman Spectroscopy 21 (1990), S. 55-63 
    Details
    ISSN: 0377-0486
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The influence of thermally excited vibrations on vibronic spectra (absorption, CARS excitation profile and resonance background) has been modelled for polyatomic molecules in solution. It is shown that for a model describing some polymethine compounds, the spectra depend only slightly on temperature except in the case of a resonance background and an excitation profile of vibrations with a relatively high value of the origin shift parameter (Δ 〉 1). The investigations of low-frequency vibrations by resonance CARS to giving information about some molecular parameters is proposed.
    Additional Material: 11 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jrs.1250210111
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  • 9
    Electronic Resource
    Electronic Resource
    ‘Extra’ resonances in non-linear Raman spectroscopy (1985)
    Chichester [u.a.] : Wiley-Blackwell
    Journal of Raman Spectroscopy 16 (1985), S. 308-311 
    Details
    ISSN: 0377-0486
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: In the treatment of absorption spectra and Raman excitation profiles of polyatomic molecules, relaxation constants appear as ‘soft’ parameters. It is shown that the spectra of non-linear Raman scattering under resonance pumping conditions are sensitive to variations in the relaxation constants and the number of active vibrations, especially when ‘extra’ resonances are included. This is demonstrated by calculations of coherent Stokes Raman scattering spectra carried out using the density of states model and displaced independent harmonic oscillators. The use of non-linear Raman spectra for checking the reliability of the model descriptions of S0-S1 transitions is proposed.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jrs.1250160504
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    Paper (German National Licenses)
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