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  • 1
    Electronic Resource
    Electronic Resource
    Structure of hexamethylene triperoxide diamine (1985)
    s.l. : American Chemical Society
    Journal of the American Chemical Society 107 (1985), S. 2461-2463 
    Details
    ISSN: 1520-5126
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ja00294a043
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  • 2
    Electronic Resource
    Electronic Resource
    The transient grating: a holographic window to dynamic processes (1992)
    s.l. : American Chemical Society
    Accounts of chemical research 25 (1992), S. 227-233 
    Details
    ISSN: 1520-4898
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ar00017a004
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  • 3
    Electronic Resource
    Electronic Resource
    Theory of nonlinear optical experiments with harmonic oscillators (1995)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 103 (1995), S. 4393-4407 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: We develop a theory of photon-echo phenomena in harmonic vibrational modes. Although classical harmonic oscillators cannot produce any nonlinear optical signal in the linear response limit, we demonstrate that quantum harmonic oscillators that are coupled to any physically reasonable bath can give rise to novel nonlinear optical behavior, even in the perturbative limit. We show that photon echoes in high-frequency vibrational modes are strongly affected by both population relaxation and pure dephasing. The time dependence of the echo signal is shown to be highly sensitive to the amount of inhomogeneous broadening in the vibrational line. As an example, we develop the simple model of population relaxation resulting from linear coupling to the bath and pure dephasing resulting from quadratic coupling to the bath. Counter to the classical picture, echo signal is present when the only coupling to the bath is linear, but absent when the only coupling is quadratic. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.470680
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  • 4
    Electronic Resource
    Electronic Resource
    Exponential intermolecular dynamics in optical Kerr effect spectroscopy of small-molecule liquids (1999)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 111 (1999), S. 2686-2694 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Optical Kerr effect spectroscopy has been employed to study the behavior of six symmetric-top liquids (acetonitrile, acetonitrile-d3, benzene, carbon disulfide, chloroform, and methyl iodide) over a broad range of temperatures. In all of the liquids, an exponential intermolecular response is observed on a time scale of a few hundreds of femtoseconds. Comparison of the temperature dependence of the time scale of this relaxation with the viscosity and single-molecule and collective orientational times in the liquids suggests that the exponential relaxation arises from motional narrowing. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.479544
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  • 5
    Electronic Resource
    Electronic Resource
    Dynamics of a wetting liquid in nanopores: An optical Kerr effect study of the dynamics of acetonitrile confined in sol-gel glasses (1999)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 111 (1999), S. 5116-5123 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The orientational dynamics of acetonitrile and acetonitrile-d3 confined in nanoporous glasses have been studied using optical Kerr effect spectroscopy. The decays can be fit to the sum of three exponentials, the fastest of which corresponds to relaxation of bulk-like liquid. We present evidence that the intermediate exponential arises from the exchange of molecules bound to the pore surfaces into the bulk liquid, whereas the slowest exponential corresponds to surface relaxation. A comparison to nuclear magnetic resonance data demonstrates that the liquid at the pore surfaces is more highly ordered than that in the bulk. Surface-modification studies demonstrate that hydrogen bonding is responsible for the extreme inhibition of dynamics at the pore surfaces. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.479768
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  • 6
    Electronic Resource
    Electronic Resource
    Molecular coordinates for instantaneous normal mode calculations. I. Coordinate dependence (1999)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 110 (1999), S. 10410-10422 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: We demonstrate that the results of instantaneous normal mode (INM) calculations depend strongly on the coordinate system used, particularly when flexible molecules are employed. Appropriate INM treatments of rotation, bending, and rotational kinetic energy are illustrated and discussed, and a set of criteria for the selection of coordinates for INM calculations on molecular liquids is presented. A general scheme for developing molecular coordinates is introduced. This method simplifies the derivation of the expressions required for INM calculations, particularly for the kinetic energy. A technique for correcting the INM frequencies, applicable in some situations, is also presented. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.479048
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  • 7
    Electronic Resource
    Electronic Resource
    Nonresonant intermolecular spectroscopy beyond the Placzek approximation. II. Fifth-order spectroscopy (1998)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 109 (1998), S. 7913-7922 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: We present an instantaneous normal mode analysis of the fifth-order polarizability-weighted densities of states for CS2 for experimentally relevant polarization conditions. We illustrate that polarization selectivity can be used to enhance selectively different contributions to the fifth-order spectrum. We show that the fifth-order spectrum arises predominantly from collision-induced scattering and from cross terms between collision-induced effects and librations, with only a vanishingly small pure librational contribution. We also demonstrate that there is no direct relationship between the third- and fifth-order Raman-weighted densities of states. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.477439
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  • 8
    Electronic Resource
    Electronic Resource
    Polarization selectivity of nonresonant spectroscopies in isotropic media (1997)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 107 (1997), S. 9726-9740 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: We present an analysis of the contributions of the first- and second-derivative tensors of the many-body polarizability to third- and fifth-order nonresonant spectroscopies in isotropic media. Collision-induced effects are shown to have a notable influence on the second-derivative polarizability tensor (Π(2)) for intermolecular modes. As a result, polarization selectivity in nonresonant intermolecular spectroscopies can be achieved in fifth-order spectroscopies. Additionally, terms in fifth-order spectroscopy that arise from three interactions through Π(2) may not be negligible in many liquids. Our analysis shows that there exists no straightforward relationship between the observables in third- and fifth-order intermolecular spectroscopies. The predictions of this analysis are tested against the available experimental data for CS2. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.475269
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  • 9
    Electronic Resource
    Electronic Resource
    Molecular coordinates for instantaneous normal mode calculations. II. Application to CS2 and other triatomics (1999)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 110 (1999), S. 10423-10432 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: We derive and demonstrate appropriate molecular coordinates for instantaneous normal mode calculations on liquids composed of linear and bent triatomic molecules. Comparisons are made between calculations in atomic Cartesian and molecular coordinates, the latter using both laboratory-frame Euler-angle and molecular-frame rotational coordinates. Results are contrasted for coordinate systems with both rigid (with no internal degrees of freedom) and flexible molecules. The coordinate dependences of the density of states, its breakdown into translational and rotational contributions, participation ratios and instantaneous normal mode (INM) spectroscopic quantities are examined and discussed. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.478973
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  • 10
    Electronic Resource
    Electronic Resource
    Nonresonant intermolecular spectroscopy beyond the Placzek approximation. I. Third-order spectroscopy (1998)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 109 (1998), S. 2814-2825 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: We present an instantaneous normal mode analysis of the intermolecular Raman-weighted density of states of CS2, including the effects of the second-derivative tensor of the many-body polarizability. Based on the results of these calculations, we suggest a set of minimal elements that are necessary for collective-coordinate models of polarizability dynamics in liquids. The effects of different scattering mechanisms, the tensor nature of the polarizability, and the complex relationship between derivatives of the polarizability for intermolecular modes are shown to be essential elements of such a model. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.476850
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