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  • 82.60.Hc  (2)
  • 75.10  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Temperature-dependent photoacoustic spectroscopy with a Helmholtz resonator (1996)
    Springer
    Applied physics 63 (1996), S. 389-397 
    Details
    ISSN: 1432-0649
    Keywords: PACS: 07.65.Gj ; 82.60.Hc ; 82.80.Kq
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract.  CO-laser photoacoustic spectroscopy (PAS) is introduced to monitor the absorption of fatty acid vapors in the temperature range between 280 and 350 K. Since, the absorption as well as the photoacoustic (PA) signal depend on temperature, simultaneous transmission measurements have been performed to calibrate the PA signal at every temperature. A special PA cell acting as a Helmholtz resonator has been constructed fulfilling the requirements for temperature-dependent PA measurements. The results of numerical calculations of the acoustic properties of the PA cell are compared with experimental measurements with respect to the frequency response, the quality factor of the cell and the temperature dependence of the cell constant. As an example, the analysis of the obtained absorption spectra of deuterated acetic acid, which were recorded with this set-up, revealed the dimerization enthalpy ΔH and entropy ΔS as well as the integrated band absorbances of the C=O-vibration of the monomer and dimer molecules at CO-laser wavelengths.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01828744
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Temperature-dependent photoacoustic spectroscopy with a Helmholtz resonator (1996)
    Springer
    Applied physics 63 (1996), S. 389-397 
    Details
    ISSN: 1432-0649
    Keywords: 07.65.Gj ; 82.60.Hc ; 82.80.Kq
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract CO-laser photoacoustic spectroscopy (PAS) is introduced to monitor the absorption of fatty acid vapors in the temperature range between 280 and 350 K. Since, the absorption as well as the photoacoustic (PA) signal depend on temperature, simultaneous transmission measurements have been performed to calibrate the PA signal at every temperature. A special PA cell acting as a Helmholtz resonator has been constructed fulfilling the requirements for temperature-dependent PA measurements. The results of numerical calculations of the acoustic properties of the PA cell are compared with experimental measurements with respect to the frequency response, the quality factor of the cell and the temperature dependence of the cell constant. As an example, the analysis of the obtained absorption spectra of deuterated acetic acid, which were recorded with this set-up, revealed the dimerization enthalpyΔH and entropyAS as well as the integrated band absorbances of the C=O-vibration of the monomer and dimer molecules at CO-laser wavelengths.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01828744
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Cuprates intermediate between one and two dimensions (1994)
    Springer
    Journal of low temperature physics 95 (1994), S. 299-308 
    Details
    ISSN: 1573-7357
    Keywords: 75.10 ; 74.20 ; 74.72
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The key elements in all known cuprate superconductors are lightly doped CuOi-planes. Recently a new homologous series of compounds Srn−1Cun+1O2n have been reported in which the planes contain a parallel array of line defects which form a trellis lattice with ladder-segments of the square lattice weakly coupled through triangular line defects. The width of the ladder segments is determined by the parameter n and varies from single chains to arbitrarily wide ladders. The magnetic properties of undoped compounds will be dominated by the properties of the ladders. Heisenberg s = 1/2 ladders can have a spin liquid groundstate with a spin gap if the number of rungs is odd so that a short range RVB groundstate is predicted for such trellis lattices. Using a t-J model to describe the doped material leads to the prediction of a d-wave RVB superconducting groundstate with a large spin gap.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00754945
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
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