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  • 1
    Electronic Resource
    Electronic Resource
    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
    Keywords: 42.70 ; 81.40 ; 61.80
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: 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.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01080928
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Time-of-flight measurement of resonant molecular formation in muon-catalyzed dt fusion (1996)
    Springer
    Hyperfine interactions 101-102 (1996), S. 47-55 
    Details
    ISSN: 1572-9540
    Keywords: muon-catalyzed fusion ; muonic hydrogen ; muonic atoms ; muonic molecules
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Preliminary results are reported for an experiment at TRIUMF where a time-of-flight technique was tested for measuring the energy dependence of the rate for muon-catalyzed dt fusion. Muonic tritium atoms were created following transfer of negative muons from muonic protium in a layer of solid hydrogen (protium) containing a small fraction of tritium. The atoms escaped from the solid layer via the Ramsauer-Townsend mechanism, traversed a drift region of 18 mm, and then struck an adjacent layer of deuterium, where the muonic atom could form a molecular system. The time of detection of a fusion product (neutron or alpha) following muon arrival is dependent upon the energy of the muonic tritium atom as it traverses the drift region. By comparison of the time distribution of fusion events with a prediction based on the theoretical energy dependence of the rate, the strength of resonant formation can in principle be determined. The results extracted so far are discussed and the limitations of the method are examined.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02227605
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  • 3
    Electronic Resource
    Electronic Resource
    Resonant formation measurements of $$dt\mu $$ via time of flight (1999)
    Springer
    Hyperfine interactions 118 (1999), S. 89-101 
    Details
    ISSN: 1572-9540
    Keywords: muon catalyzed fusion ; resonant formation ; muonic atoms ; muonic hydrogen ; exotic atoms
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Solid hydrogen in the form of an inhomogeneous layered target offers several experimental advantages when compared with liquid or gas. Beams of non-thermalized muonic hydrogen atoms allow us to explore resonant molecular ion formation processes near eV kinetic energies. Isotopically specific layers make it possible to separate competing and confusing interactions and to employ the time of flight for comparison with predictions based on theoretical energy dependences. Unambiguous charged fusion product detection simplifies absolute intensity measurements. The systematic uncertainties encountered in resonant molecular ion formation measurements, using solid hydrogen target layers, are being investigated with simulations which use the many calculated energy-dependent rates and cross-sections which are now available. The importance of the rates for processes such as muon transfer and elastic scattering are discussed, and results of some recent analyses are presented.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1012636619847
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  • 4
    Electronic Resource
    Electronic Resource
    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
    Keywords: 20(R,S)-Hydroxy-23-norcholanoic acid derivatives ; 1H NMR ; Pyridine-induced shifts ; Molecular mechanics calculations ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: 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.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mrc.1260290208
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