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  • 1990-1994  (10)
  • 1
    Electronic Resource
    Electronic Resource
    Potentiality of the photothermal surface-displacement technique for precisely performed absorption measurement of optical coatings (1994)
    Springer
    Applied physics 58 (1994), S. 377-383 
    Details
    ISSN: 1432-0630
    Keywords: 78.20.Nv ; 42.78.Hk ; 68.35.Gy ; 68.45.Nj
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract The influence of sample properties on the measured signal has to be investigated, so that measurements of the optical absorption in thin-film coatings by means of the photothermal surface-displacement technique may be precisely performed. Carrying out simultaneously absorption measurements on metal coatings at λ=10.6 μm by using laser calorimetry as well as the surface-displacement technique, the aforementioned influence and the validity of assumptions of the theoretical model, respectively, can be proven. It can be demonstrated that, in contrast to the model, thermophysical coating properties contribute to the probed surface displacement.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00323613
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  • 2
    Electronic Resource
    Electronic Resource
    Torsional band assignment and intramolecular twist potential of 9,9'-bianthryl and its 10-cyano derivative in a free jet (1990)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 93 (1990), S. 4543-4555 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Using a pulsed supersonic beam and laser-induced fluorescence spectroscopy the torsional structure of the S0 and S1 states of 9,9'-bianthryl (BA) and its derivative 10-(cyano)-9,9'-bianthryl (CBA) was investigated. Taking into account the very different equilibrium positions of the S0 and S1 potentials which result in a nonobservable 0–0 transition within the jet spectra, a new and straightforward procedure of torsional band assignment is carried out. This is based on a characteristic pattern of Franck–Condon factors within the dispersed fluorescence spectra. The torsional potentials were determined by a fit procedure of a one-dimensional model to the experimental data. The results show that the S1 double minimum potential for BA is shallower than for CBA indicating a stronger interaction between the molecular halfs of the latter compound. The observed rotational contours of torsional bands recorded for CBA reflect the change from a symmetric top molecule (for states above the S1 torsional barrier) to an asymmetric top (for states below the barrier) and manifest the tunneling splitting of the level just below the barrier. The dispersed fluorescence spectra of CBA are discussed in terms of intramolecular vibrational redistribution (IVR) processes. The measured fluorescence decay rates as a function of excess vibrational energy of CBA reflect a saturation behavior already within the origin region in contrast to BA (saturation near 380 cm−1). This is tentatively ascribed to a low lying dark background state possibly of charge transfer character.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.458695
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Resonance effects of diabatic surface crossing within the torsional spectrum of 9-(N-carbazolyl) anthracene observed by supersonic jet fluorescence spectroscopy (1993)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 98 (1993), S. 2580-2592 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Using the supersonic jet technique and laser-induced fluorescence spectroscopy, the ground and excited state surface of isolated 9-(N-carbazolyl) anthracene (C9A) is investigated. Ground and excited state torsional potentials of high accuracy are deduced from excitation and fluorescence spectra, considering characteristic patterns of Franck–Condon factors within the dispersed fluorescence. S0 exhibits a very flat double minimum potential (equilibrium twist angle 77.5°, barrier 17 cm−1); the barrier for perpendicularity in S1 is approximately 1050 cm−1 and the equilibrium angle is shifted towards coplanarity (64°). An unusual intensity profile of the long progression found in the fluorescence excitation spectrum is ascribed to a resonant nonradiative decay channel within the excited state surface. State selective fluorescence decay rates vs excess vibrational energy confirm this resonant relaxation process. This uncommon observation leads to a model of diabatic surface crossing along the torsional coordinate where the crossing "dark'' state is discussed as a predicted charge transfer state or a higher lying triplet state, mediating further electronic relaxation. Although extended intermolecular vibrational redistribution (IVR) is present in the fluorescence spectra from high vibrational levels, this process is of secondary importance for the resonant nonradiative relaxation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.464140
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  • 4
    Electronic Resource
    Electronic Resource
    Anthropogenic influence on the distribution of tropospheric sulphate aerosol (1992)
    [s.l.] : Nature Publishing Group
    Nature 359 (1992), S. 712-716 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] We use the three-dimensional Eulerian transport model MOGUNTIA5 in our calculations. This is based on monthly mean meteorological data and covers the global troposphere with a horizontal resolution of 10° longitude by 10° latitude, and with 10 vertical layers between the surface and 100 ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/359712a0
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  • 5
    Electronic Resource
    Electronic Resource
    Ozone measurements from the Balloon Intercomparison Campaign (1990)
    Springer
    Journal of atmospheric chemistry 10 (1990), S. 181-218 
    Details
    ISSN: 1573-0662
    Keywords: Ozone ; intercomparison ; balloon ; stratosphere
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Geosciences
    Notes: Abstract Measurements of the Balloon Intercomparison Campaign (BIC), conducted during fall, 1982 (BIC-1) and summer, 1983 (BIC-2), are reported. Results of five remote and two in situ techniques agree (with a few exceptions) within 95% confidence level uncertainties and generally within 15% above 20 km. Weighted mean profiles, which best represent conditions during the capaign, are used as a comparison standard. Accuracies of experiments indicated by BIC generally confirm estimated uncertainites for ECC sondes, UV photometry, and microwave emission experiments, are somewhat better for far IR emission and IR absorption experiments, and are somewhat worse for IR emission and solar UV absorption experiments. The large collection of BIC measurements confirms a problem reported earlier with current theoretical modeling of ozone near 40 km where transport is negligible and the chemistry is believed to be simpler.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00054856
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  • 6
    Electronic Resource
    Electronic Resource
    Influence of a transport current on the local magnetic field distribution in sintered YBa2Cu3Ox (1991)
    Springer
    Hyperfine interactions 63 (1991), S. 33-39 
    Details
    ISSN: 1572-9540
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The influence of a transport current on the magnetic flux-line distribution in sintered YBCO was studied by means of μSR. Pronounced differences between zero-field-cooled (ZFC) and field-cooled (FC) signals and irreversible behavior were observed. In the ZFC case even a small transport current (10 A/cm2) tends to orderirreversibly the inhomogeneous flux-line distribution considerably, suggesting a broad distribution of pinning barriers. However, for a FC sample no noticeable change in the flux distribution in the presence of a transport current (up to 40 A/cm2) was detected, indicating that the FC state represents a stable flux-line configuration.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02395982
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  • 7
    Electronic Resource
    Electronic Resource
    Angle dependence of the muon relaxation rate in the mixed state for single crystals of YBa2Cu3O7-δ (1991)
    Springer
    Hyperfine interactions 63 (1991), S. 71-72 
    Details
    ISSN: 1572-9540
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02395986
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  • 8
    Electronic Resource
    Electronic Resource
    μSR in oxygen deficient YBa2Cu3O x (6.5⩽x⩽7.0) (1991)
    Springer
    Hyperfine interactions 63 (1991), S. 25-31 
    Details
    ISSN: 1572-9540
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A systematic μSR study of the local magnetic field distribution in a series of oxygen deficient YBa2Cu3O x samples with 6.5⩽x⩽7.0 is reported. Special attention was given to perform the experiments under the same conditions, so that the oxygen content of the measured samples was the only parameter varied. The behavior of the depolarization rate σ as a function of the oxygen contentx was found to have strong similarities with the behavior of the critical temperatureT c as a function ofx. In particular, two step-like increases of σ were observed abovex=6.7 and 6.9. The temperature dependence of the normalized depolarization rate σ(T)/σ(0) is well described by the two-fluid model forx⩾6.781(1) and clearly deviates from this behavior forx⩽6.704(1). Our results are compared to those obtained by other groups.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02395981
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  • 9
    Electronic Resource
    Electronic Resource
    Analysis of autoionizing Rydberg series Cu I 3d 9 4snl with the multichannel quantum defect theory (1993)
    Springer
    The European physical journal 27 (1993), S. 115-121 
    Details
    ISSN: 1434-6079
    Keywords: 32.80.Dz ; 32.80.Fb ; 32.80.Rm
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Using atomic beam technique, a combination of collisional and laser excitation, and photoion detection, autoionizing Cu I states in the region of the ionization limits Cu II 3d 9 4s(3,1 D) were investigated. In spite of the complicated structure of the signals due to the four different ionization limits3 D 3,3 D 2,3 D 1 and1 D 2 and the large number of possible (LSJ)-states, which can be reached by this experimental technique, the majority of the signals could be attributed to definite Rydberg series 3d 9 4s(3 D 3,3 D 2,3 D 1,1 D 2)nl (LSJ). Perturbations were analyzed by the three- and four-channel quantum defect theory and by Hartree-Fock calculations. General formulas for the calculation of the photoionization cross section by the four-channel quantum defect theory in the case of two closed and two open channels are given.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01426758
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  • 10
    Electronic Resource
    Electronic Resource
    Investigation of autoionizing CuI-states in the region of the second ionization limit CuII 3d 94s (1992)
    Springer
    The European physical journal 23 (1992), S. 115-119 
    Details
    ISSN: 1434-6079
    Keywords: 32.80.Dz ; 32.80.Fb ; 32.80.Rm
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The combination of collisional and laser excitation was used for the investigation of autoionizing CuI states in the region of the second ionization limit CuII 3d 9 4s at 85000–95000 cm−1. The analysis of the complicated signal structure was concentrated on the first measurement of CuI 3d 9 4p 2 levels. The experimental results are compared with Hartree-Fock calculations of the energy values and level widths of the autoionization resonances.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01436732
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