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  • 1
    Electronic Resource
    Electronic Resource
    Vibrational assignments and a potential function for 3,3-difluorocyclopropene-d0, -d1, and -d2 (1978)
    s.l. : American Chemical Society
    The @journal of physical chemistry 〈Washington, DC〉 82 (1978), S. 1056-1070 
    Details
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/j100498a020
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  • 2
    Electronic Resource
    Electronic Resource
    Local mode spectra of inequivalent C-H oscillators in cycloalkanes and cycloalkenes (1982)
    s.l. : American Chemical Society
    The @journal of physical chemistry 〈Washington, DC〉 86 (1982), S. 1478-1484 
    Details
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/j100397a054
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  • 3
    Electronic Resource
    Electronic Resource
    A Raman study of solvent effects on .eta.-butane: torsional dynamics, rotational dynamics, and conformational equilibrium (1991)
    s.l. : American Chemical Society
    The @journal of physical chemistry 〈Washington, DC〉 95 (1991), S. 2209-2217 
    Details
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/j100159a023
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  • 4
    Electronic Resource
    Electronic Resource
    Torsional damping and solvent friction in liquid n-butane: Experimental estimates from Raman spectroscopy (1989)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 91 (1989), S. 3895-3902 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The isotropic Raman linewidths of the in-phase CCC bending modes of liquid n-butane are analyzed in terms of dephasing by torsional oscillations. A simple, effective Hamiltonian is developed to calculate the coupling between this bending mode and the torsion. For the gauche conformer the coupling is linear in the torsional coordinate and quite strong, but for the trans conformer the coupling is weak. This coupling is used to relate the linewidths of the bending modes to the torsional dynamics, which are modeled by a damped, harmonic oscillator. The damping constant and a related torsional correlation time are then extracted from the experimental linewidths. The resulting correlation times are compared with those calculated assuming either hydrodynamic or collisional (Enskog) friction on the torsional coordinate. Both theoretical models give values that lie below the experimental upper bound, but the Enskog friction compares somewhat better with our best experimental estimates of the torsional damping.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.456821
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  • 5
    Electronic Resource
    Electronic Resource
    Relaxation in supercooled liquids: Similarities between projected and unprojected correlation functions (1989)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 90 (1989), S. 6549-6554 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: We have examined and interrelated a number of different relaxation processes in supercooled liquids by use of molecular correlation functions, some of which are newly developed and have projected dynamics. Experimentally it is found that in supercooled liquids both the projected and unprojected correlation functions yield similar Cole–Cole plots with skewed arc behavior. The similarity between the projected and unprojected correlation functions is possible only for a certain range of the parameter μJr(0)[τm/τcd]β, where μ and Jr(ω) are the shear modulus and retardational compliance, respectively, τm is the Maxwell stress relaxation time, and τcd and β are the relaxation time and spectral width parameter, respectively, which describe a Cole–Davidson representation of the skewed arc behavior of Jr(ω). The fact that this experimental parameter is found to be of order 2, independent of temperature, has been known, but the fact that values close to this are required for the projected and unprojected correlation functions to be similar, which in turn is required for the Cole–Cole plots for dielectric correlation and retardational compliance to be similar (as observed) is a feature newly explored in this article.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.456683
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  • 6
    Electronic Resource
    Electronic Resource
    Relaxation in supercooled liquids: A generalized hydrodynamic description (1989)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 90 (1989), S. 6555-6562 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: We focus on the frequency dependence of the viscosity η(ω), or more specifically, of the retardational compliance Jr(ω), for supercooled liquids. We pursue a phenomenological approach which is related to extended hydrodynamics and is of a form compatible with a mode–mode coupling theory. While many of the transport coefficients entering the analysis are interrelated so as to give the correct temperature and frequency dependences of the observed quantities, an important consequence of the model is the prediction of nonArrhenius behavior for the Maxwell relaxation time τm. Our phenomenological approach suggests a mode coupling picture in which the bilinear modes are "semiconserved''; in turn, the mode coupling analysis gives molecular insights into the empirical transport or relaxation coefficients.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.456322
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  • 7
    Electronic Resource
    Electronic Resource
    Rotational–translational coupling and asymmetric line shapes in the high resolution stimulated Brillouin gain spectra of liquid carbon disulfide (1992)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 97 (1992), S. 8906-8914 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: We have measured high resolution stimulated Brillouin gain spectra of liquid carbon disulfide at a number of temperatures between 158 and 301 K. As the temperature decreases the shape of the Brillouin peak becomes increasingly asymmetric, with the intensity skewed away from the center of the spectrum. We show that this unusual asymmetry results from the coupling between rotational and translational motions. Rotational–translational coupling is well known to give rise to line shape distortions in the depolarized light scattering spectra of nonspherical molecules (e.g., the "Rytov dip''), but the observation of line shape distortions (the asymmetry) in the polarized Brillouin lines has not been noted before. In the latter case, the asymmetry in the Brillouin peak can be traced to a cross correlation between the collective molecular orientation variable and the number density fluctuation and can be viewed as an acoustically induced birefringence. A calculation using the theory of rotational–translational coupling and experimental values for the relevant parameters reproduces quantitatively the observed asymmetry in the Brillouin lines over the entire temperature range.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.463365
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  • 8
    Electronic Resource
    Electronic Resource
    High-resolution stimulated Brillouin gain spectroscopy of liquid carbon disulfide: Dependence of the linewidths and peak gain on scattering angle (1992)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 97 (1992), S. 19-25 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: We have used narrow linewidth continuous-wave lasers to obtain high-resolution stimulated Brillouin gain (SBG) spectra of liquid carbon disulfide at various scattering angles. For back-scattering angles, the linewidths of the SBG peaks reflect the natural lifetimes of the stimulated acoustic waves, whereas for forward-scattering angles the linewidths are dominated by laser jitter and by the uncertainty in the scattering wave vector that results from focusing the laser beams in the interaction region. The peak gain for the forward-scattering SBG spectra is an order of magnitude smaller than that observed at a back-scattering angle of 178°. The dependence of the peak gain on scattering angle can be accounted for quantitatively by considering the angle dependencies of the Brillouin frequency, linewidth, and laser beam crossing efficiency.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.463617
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  • 9
    Electronic Resource
    Electronic Resource
    High resolution stimulated Brillouin gain spectrometer (1994)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 65 (1994), S. 34-41 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: We describe a stimulated Brillouin gain (SBG) spectrometer based on low power continuous-wave frequency-stabilized lasers. The high resolution and broad tuning range of this spectrometer are demonstrated through a SBG spectrum of glycerol in the glassy state (T=146 K). The narrow Brillouin linewidth (17 MHz half-width at half-maximum) and large Brillouin shift (17.31 GHz) in this spectrum illustrate the extremely high equivalent "finesse'' of the instrument, a finesse that would be difficult to achieve through interferometric techniques. The accuracy and precision with which the Brillouin shift can be measured are demonstrated using SBG spectra of liquid methylene chloride as an example. Our Brillouin shift values obtained over the temperature range 178–300 K are in excellent agreement with values measured previously by others using spontaneous and stimulated Brillouin scattering.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1144743
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  • 10
    Electronic Resource
    Electronic Resource
    Motional collapse of methyl group vibrational bands (1980)
    s.l. : American Chemical Society
    Journal of the American Chemical Society 102 (1980), S. 3976-3976 
    Details
    ISSN: 1520-5126
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ja00531a062
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