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  • 1
    Digitale Medien
    Digitale Medien
    Unified description of electron transfer and nonlinear optical spectroscopy (1989)
    s.l. : American Chemical Society
    Accounts of chemical research 22 (1989), S. 301-308 
    Details
    ISSN: 1520-4898
    Quelle: ACS Legacy Archives
    Thema: Chemie und Pharmazie
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1021/ar00165a002
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  • 2
    Digitale Medien
    Digitale Medien
    Cathodoluminescence Microscopy of Semiconductor Devices Using a Novel Detector with High Collection and Backscattered Electron Rejection Efficiency (1998)
    s.l. ; Stafa-Zurich, Switzerland
    Solid state phenomena Vol. 63-64 (Dec. 1998), p. 159-170 
    Details
    ISSN: 1662-9779
    Quelle: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Thema: Physik
    Materialart: Digitale Medien
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/26/transtech_doi~10.4028%252Fwww.scientific.net%252FSSP.63-64.159.pdf
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  • 3
    Digitale Medien
    Digitale Medien
    Microwave Synthesis of BaTiO〈sub〉3〈/sub〉 from BaCO〈sub〉3〈/sub〉 and TiO〈sub〉2〈/sub〉 (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 336-338 (Apr. 2007), p. 669-671 
    Details
    ISSN: 1013-9826
    Quelle: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Thema: Maschinenbau
    Notizen: BaTiO3 powder was synthesized from BaCO3 and TiO2 using a domestic microwave oven. Thesamples were synthesized under different temperatures with various holding times. X-ray diffraction(XRD) and scanning electron microscopy (SEM) were used to examine the phase compositions andmorphologies of the result samples. The main phase obtained at 950°C was BaTiO3, and the intermediatephases Ba2TiO4 and Ba4TiO9 were also detected. The pure, well-crystallized BaTiO3 powder could beobtained at 1050°C within 10 minutes and the particle size ranged from 300~500nm. In comparison withconventional synthesis, faster speed and finer grains could be achieved through microwave heating
    Materialart: Digitale Medien
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/53/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.336-338.669.pdf
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  • 4
    Digitale Medien
    Digitale Medien
    A fracture damage model for Jointed rock masses and its application to the stability analysis of dam abutments (1991)
    Springer
    Acta mechanica solida Sinica 4 (1991), S. 101-116 
    Details
    ISSN: 0894-9166
    Schlagwort(e): fracture ; damage mechanics ; stability of dam abutment ; arch dam ; jointed rock mass ; damage tensors
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Maschinenbau , Physik
    Notizen: Abstract Based on continuum damage mechanics, for jointed rock masses, a fracture damage model is presented in this paper. First, the damage tensors are defined through the elastic-flexibility of intact rock and the equivalent elastic-damage flexibility for rock mass. Then, by the self-consistent principle of solid mechanics, the equivalent elastic-damage flexibility tensors involving the interaction between multicracks are deduced. The damage evolution law is proposed involving the mechanism of crack propagation process: frictional sliding, crack kinking, growing of branched tension cracks, interlinking of the microcracks near branched crack tips leading to the breakthrough of macro-cracks and finally the failure of rock mass. Thus the evolution of damage variables reasonably unified with the process of crack propagation is given. Finally, a plastic-brittle damage constitutive relation including brittle coupled strain rate, developed and applied to the stability analysis of complicated rock foundation of a dam in China, is described in this paper.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF02208114
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  • 5
    Digitale Medien
    Digitale Medien
    Time-resolved fluorescence and hole-burning line shapes of solvated molecules: Longitudinal dielectric relaxation and vibrational dynamics (1987)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 87 (1987), S. 5840-5857 
    Details
    ISSN: 1089-7690
    Quelle: AIP Digital Archive
    Thema: Physik , Chemie und Pharmazie
    Notizen: We develop a microscopic theory of time- and frequency-resolved fluorescence and hole-burning measurements of polar, polyatomic molecules in a polar solvent. The line shapes are expressed in terms of gas phase spectroscopic parameters of the solute, vibrational relaxation rates, laser pulse shapes, and the dynamics of a solvation coordinate. These dynamics are then related to the frequency and wave vector dependent dielectric function of the solvent. Both fluorescence and hole-burning line shapes are predicted to show significant line narrowing at short times, and to undergo broadening and a red shift as the solvent relaxes. We propose hole burning as an alternative to fluorescence measurements in probing solvation dynamics. The time scale of the solvent induced line shift and line broadening is found to be independent of the shape of the solute, in contrast with previous work. The effects of vibrational relaxation are distinguished from those of solvent relaxation.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.453507
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  • 6
    Digitale Medien
    Digitale Medien
    Molecular fluorescence and near resonance Raman yield as a probe for solvation dynamics (1987)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 86 (1987), S. 6085-6107 
    Details
    ISSN: 1089-7690
    Quelle: AIP Digital Archive
    Thema: Physik , Chemie und Pharmazie
    Notizen: A microscopic theory for spontaneous emission line shapes of polyatomic molecules in condensed phases is developed. The distinction between the Raman and the fluorescence component is discussed and a rigorous transform relation between the total Raman excitation profile and the absorption line shape is obtained. The effects of solvation are introduced via generalized solvent line shape functions corresponding to the solvent dynamics before and after the reorganization process which follows the electronic excitation. The Raman yield and its frequency dependence are shown to provide a sensitive probe for the solvent dynamics. Detailed calculations for model systems and for the retinal chromophore in bacteriorhodopsin are presented.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.452448
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  • 7
    Digitale Medien
    Digitale Medien
    Electronic dephasing, vibrational relaxation, and solvent friction in molecular nonlinear optical line shapes (1988)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 89 (1988), S. 5160-5176 
    Details
    ISSN: 1089-7690
    Quelle: AIP Digital Archive
    Thema: Physik , Chemie und Pharmazie
    Notizen: The role of solvation dynamics in molecular nonlinear optical line shapes is analyzed using a reduced description based on the time evolution of the density matrix in Liouville space. Langevin equations are used to treat the coupling of the solvent to the molecular electronic and nuclear degrees of freedom. Electronic dephasing is calculated using a solvation coordinate which satisfies a generalized Fokker–Planck equation, and vibrational relaxation is related to the solvent viscosity and friction. The combined effect of both processes is incorporated into appropriate multitime correlation functions which are evaluated using a Liouville-space generating function. The present eigenstate-free approach is particularly suitable for calculating spectral line shapes as well as rate processes (isomerization, electron transfer) of large polyatomic molecules in condensed phases.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.455634
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  • 8
    Digitale Medien
    Digitale Medien
    Semiclassical dynamics in Liouville space: Application to molecular electronic spectroscopy (1988)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 88 (1988), S. 5735-5748 
    Details
    ISSN: 1089-7690
    Quelle: AIP Digital Archive
    Thema: Physik , Chemie und Pharmazie
    Notizen: A semiclassical theory of molecular dynamics and electronic spectroscopy, based on the propagation of a Liouville-space generating function (LGF) is developed. The method is particularly useful for treating the dynamics of systems, consisting of coupled classical and quantum degrees of freedom. Applications to intramolecular and intermolecular dynamics, correlation functions, and spectral line shapes in linear and nonlinear optical measurements are developed. The electronic absorption line shapes and Raman excitation profiles of model anharmonic molecules at finite temperatures are calculated as a demonstration.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.454533
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  • 9
    Digitale Medien
    Digitale Medien
    Reduced equations of motion for semiclassical dynamics in phase space (1987)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 86 (1987), S. 3441-3454 
    Details
    ISSN: 1089-7690
    Quelle: AIP Digital Archive
    Thema: Physik , Chemie und Pharmazie
    Notizen: Time-dependent self-consistent equations for semiclassical dynamics in phase space are developed. The method is based on constructing a Gaussian density matrix, whose equations of motion are obtained by requiring that the first two moments of the coordinates and momenta have the correct time evolution. The method can yield, in principle, the exact values of these moments for all time. The present method can be applied for the time evolution of mixed states in phase space and may, therefore, be particularly useful for molecular dynamics in condensed phases. Raman excitation profiles in anharmonic molecules are calculated and show excellent agreement with exact calculations.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.452000
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  • 10
    Digitale Medien
    Digitale Medien
    Photon echoes of polyatomic molecules in condensed phases (1991)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 94 (1991), S. 179-190 
    Details
    ISSN: 1089-7690
    Quelle: AIP Digital Archive
    Thema: Physik , Chemie und Pharmazie
    Notizen: A theory of optical echo spectroscopies of large polyatomic molecules in condensed phases is developed. Using phase space correlation functions, we examine the interrelationships among the following optical measurements: ordinary photon echo, stimulated photon echo, accumulated photon echo, incoherent accumulated photon echo, and pump–probe absorption. Conditions for the elimination of inhomogeneous broadening in these experiments are specified. A multimode Brownian oscillator model is used to account for high frequency molecular vibrations, as well as solvent modes, and electronic dephasing processes. The effects of quantum beats, spectral diffusion, and homogeneous dephasing on the echo signals are studied and compared in detail with pump–probe and hole burning spectroscopy.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.460376
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