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  • 1
    Digitale Medien
    Digitale Medien
    Fluorescence-excitation and hole-burning spectroscopy of heavy-dose neutron-irradiated α-Al2O3 (1995)
    Springer
    Applied physics 60 (1995), S. 507-512 
    Details
    ISSN: 1432-0649
    Schlagwort(e): 42.70 ; 81.40 ; 61.80
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract We report on persistent spectral hole-burning and fluorescence-excitation spectroscopy in heavy-dose (3 × 1020 n/cm2) neutron-irradiated and annealed sapphire using a Ti:Sapphire ring laser in single-frequency and broad-band operation. The optimum conditions for hole burning were obtained after annealing the crystals to 400 °C. Holes have been detected in the near-infrared spectral range between 745 and 795 nm. At 1.5 K, the narrowest hole widths were approximately 2 GHz, so that about 104 holes can be burnt in this spectral region. Besides the storage density in the wavelength dimension, the coefficient describing the electric-field-induced filling of a spectral hole also rises by more than one order of magnitude as compared to crystals with low neutron-irradiation dose.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01080928
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  • 2
    Digitale Medien
    Digitale Medien
    Characterization of conducting GaAs multilayers by infrared spectroscopy at oblique incidence (1990)
    Springer
    Applied physics 50 (1990), S. 7-12 
    Details
    ISSN: 1432-0630
    Schlagwort(e): 78.20 ; 78.65
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Maschinenbau , Physik
    Notizen: Abstract The electrical and geometric properties of GaAs multilayer structures are measured nondestructively by infrared reflectance spectroscopy (50–5000 cm−1). Using oblique incidence and both s- and p-polarizations of the probing beam, carrier concentration and thickness of the epitactic films as well as the carrier concentration of the GaAs substrate are determined. The main structures in the spectra are due to phonon reststrahlen bands, Fabry-Perot interferences and the zeros of the dielectric function leading to dips in the reflectance (Berreman Mode). The results compare favorably with a depth-resolved secondary ion mass spectrometric (SIMS) sample analysis. The range of applicability of the method is discussed.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00323946
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  • 3
    Digitale Medien
    Digitale Medien
    1H NMR and molecular mechanics studies of epimeric ethyl esters of 20(R, S)-hydroxy-23-norcholanoic acids (1991)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 29 (1991), S. 137-142 
    Details
    ISSN: 0749-1581
    Schlagwort(e): 20(R,S)-Hydroxy-23-norcholanoic acid derivatives ; 1H NMR ; Pyridine-induced shifts ; Molecular mechanics calculations ; Chemistry ; Analytical Chemistry and Spectroscopy
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: Proton chemical shifts for the C-18, C-21, —CO2CH2CH3 and —CO2CH2CH3 protons of epimeric ethyl esters of 20(R,S)-hydroxy-23-norcholanoic acids were measured in deuteriochloroform and pyridine-d5. The observed solvent shifts due to specific OH - pyridine hydrogen-bonded complexes allowed the quantification of the epimeric mixtures by analysis of the pyridine-d5 1H NMR spectra. The main features of the pyridine-induced shifts are rationalized in terms of the preferred conformations for the 20R- and 20S-epimers, which are predicted by molecular mechanics calculations.
    Zusätzliches Material: 3 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/mrc.1260290208
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