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  • 1
    Digitale Medien
    Digitale Medien
    Soret and mass diffusion coefficients of toluene/n-hexane mixtures (1995)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 103 (1995), S. 4367-4370 
    Details
    ISSN: 1089-7690
    Quelle: AIP Digital Archive
    Thema: Physik , Chemie und Pharmazie
    Notizen: Soret coefficients and mass diffusion coefficients of mixtures of toluene and n-hexane have been measured by thermal diffusion forced Rayleigh scattering (TDFRS) and are compared with literature data. For the mass diffusion coefficients a good agreement between different experimental techniques is found. For the Soret coefficients contradictory results are obtained from thermogravitational column measurements, small angle Rayleigh scattering, and TDFRS. Arguments supporting the TDFRS data are presented. © 1995 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.470677
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  • 2
    Digitale Medien
    Digitale Medien
    Thermal diffusivity and structural relaxation in a supercooled liquid by a holographic grating technique (1996)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 104 (1996), S. 248-254 
    Details
    ISSN: 1089-7690
    Quelle: AIP Digital Archive
    Thema: Physik , Chemie und Pharmazie
    Notizen: The decay of a spatial transient temperature grating created within the molecular glass former phenolphthalein-dimethylether (PDE) relates to the hydrodynamic heat diffusion and the dynamics of local density fluctuations. The characteristics of the latter process agree well with the structural α relaxation observed by photon correlation and dielectric spectroscopy near and above the glass transition temperature Tg. When the α-relaxation time approaches the experimental timescale set-in by the thermal diffusivity the specific heat undergoes a dispersion. In either side of this dynamic regime, heat diffusion and α relaxation are independent modes. "Two fluid'' models of the vitreous state conform to the experimental observations. © 1996 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.470895
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  • 3
    Digitale Medien
    Digitale Medien
    Stability of frequency domain information bits in amorphous organic materials (1989)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 66 (1989), S. 3232-3240 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: We investigate the stability of frequency domain information bits as a function of time and temperature fluctuations. A large body of experimental results for a variety of organic materials is presented and analyzed in terms of phenomenological models on spectral diffusion and dispersive kinetics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.344114
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  • 4
    Digitale Medien
    Digitale Medien
    Temporal intensity modulation of spectral lines in a low-frequency discharge in argon (1988)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 64 (1988), S. 3855-3862 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: The time-dependent modulation of the emission intensities of several Ari and Arii spectral lines was measured with the time-to-amplitude conversion method for an argon discharge at 50 kHz occurring between the electrodes of an asymmetric parallel plate etch reactor. Under the assumptions that the life time of an emitting state is short compared to the electric field period and that the state is populated by electron impact from the ground state, the line intensity becomes proportional to the corresponding excitation rate coefficient. This time-dependent rate coefficient is calculated from the electron energy distribution obtained by solving the quasistationary Boltzmann equation where the plasma electric field is taken to be proportional to the measured electrode potential. Good agreement between the time dependencies of measured and calculated line intensities is achieved for the selected 6d(1/2)01 →4p(1/2)1 transition in Ari if the amplitude of the plasma field is adjusted to 13 V/cm.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.341366
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  • 5
    Digitale Medien
    Digitale Medien
    THE HEAT OF WETTING OF LEAD SULFATE1 (1924)
    s.l. : American Chemical Society
    Journal of the American Chemical Society 46 (1924), S. 1158-1167 
    Details
    ISSN: 1520-5126
    Quelle: ACS Legacy Archives
    Thema: Chemie und Pharmazie
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1021/ja01670a007
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  • 6
    Digitale Medien
    Digitale Medien
    Probing of extremely low configurational barriers in an organic glass (1988)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 88 (1988), S. 6655-6657 
    Details
    ISSN: 1089-7690
    Quelle: AIP Digital Archive
    Thema: Physik , Chemie und Pharmazie
    Notizen: By measuring the reduction of a spectral hole burnt at 500 mK due to temperature cycling experiments, we show that the lower bound of the distribution function of barrier heights is below 10 cm−1.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.454405
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  • 7
    Digitale Medien
    Digitale Medien
    Investigation of polarization diffusion and relaxation dynamics of low temperature glasses (1985)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 82 (1985), S. 2935-2938 
    Details
    ISSN: 1089-7690
    Quelle: AIP Digital Archive
    Thema: Physik , Chemie und Pharmazie
    Notizen: We investigated the optical anisotropy and the normalized areas of persistent spectral holes in organic glasses over almost 1 week (4 decades). The systems studied were 1,4-dihydroxyanthraquinone and tetracene in an EtOH/MeOH glass. The areas of the holes decay on a logarithmic time scale, but the anisotropy remains constant. We draw the following conclusions: (i) There is no reorientation of dye molecules in the glass. (ii) Molecules relaxing from the product state reassume the position in the frequency domain and in space which they had before hole burning. (iii) A dye molecule seems to be strongly coupled just to one two level system (TLS).
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.448241
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  • 8
    Digitale Medien
    Digitale Medien
    Probing of conformational relaxation processes of proteins by frequency labeling of optical states (1989)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 90 (1989), S. 1270-1273 
    Details
    ISSN: 1089-7690
    Quelle: AIP Digital Archive
    Thema: Physik , Chemie und Pharmazie
    Notizen: We show how optical frequency labeling at cryogenic temperatures can be used to probe in a most direct way protein substates and to elucidate the nature of the structural relaxation processes involved.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.456131
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  • 9
    Digitale Medien
    Digitale Medien
    High resolution frequency selective photochemistry of phycobilisomes at cryogenic temperatures (1988)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 89 (1988), S. 871-874 
    Details
    ISSN: 1089-7690
    Quelle: AIP Digital Archive
    Thema: Physik , Chemie und Pharmazie
    Notizen: Highly frequency selective photochemistry at cryogenic temperatures is used to gain information on the excited state dynamics of large biomolecular aggregates, the phycobilisomes from the blue–green alga (cyanobacterium) Masticogladus laminosus. In particular, we show that in spite of the well organized structure of these aggregates disorder on a microscopic level dominates the optical spectra. The hole burning reaction in the resonantly excited chromophores is most probably due to a conformational change in the neighborhood of the chromophore. From the widths of the holes energy transfer times between different pigments on the order of 16 ps are determined. These transfer times are independent of the excitation energy.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.455209
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  • 10
    Digitale Medien
    Digitale Medien
    Higher Oxides of the Lanthanide Elements. Terbium Dioxide1 (1951)
    s.l. : American Chemical Society
    Journal of the American Chemical Society 73 (1951), S. 1475-1479 
    Details
    ISSN: 1520-5126
    Quelle: ACS Legacy Archives
    Thema: Chemie und Pharmazie
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1021/ja01148a020
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