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  • Articles: DFG German National Licenses  (7)
  • muon catalyzed fusion  (3)
  • Analytical Chemistry and Spectroscopy  (2)
  • 66.30  (1)
  • 81.40  (1)
Source
  • Articles: DFG German National Licenses  (7)
Material
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Keywords
  • 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
    Laser-induced doping of GaAs (1985)
    Springer
    Applied physics 38 (1985), S. 49-56 
    Details
    ISSN: 1432-0630
    Keywords: 66.30 ; 82.65
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract Thin layers of GaAs are heavily doped locally by laser induced Se or Zn diffusion. H2Se or diethylzinc gases are used to provide Se or Zn dopant atoms. The surface is locally heated with 3 ns light pulses from a Q-switched frequency doubled Nd-YAG laser. The doping process is described in detail. Doping profiles and sheet carrier concentrations are measured as a function of substrate temperature, laser fluence and processing time. Dopant concentrations of more than 1021 cm−3, with a thickness of the doped layer of less than 20 nm can be achieved.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00618726
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Time-of-flight spectroscopy of muonic tritium (1999)
    Springer
    Hyperfine interactions 118 (1999), S. 151-157 
    Details
    ISSN: 1572-9540
    Keywords: muonic hydrogen ; muon catalyzed fusion ; Ramsauer-Townsend effect
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Emission of muonic tritium from a solid hydrogen layer has been studied via imaging of the muon-decay electrons and the time-of-flight distributions have been compared with detailed Monte Carlo calculations. Results are consistent at the 10% level with the theoretical prediction of a Ramsauer-Townsend minimum cross-section energy.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1012653023482
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Study of μ-catalyzed fusion in H-D mixtures (1999)
    Springer
    Hyperfine interactions 118 (1999), S. 163-170 
    Details
    ISSN: 1572-9540
    Keywords: muon catalyzed fusion ; astrophysical S-factor ; muonic molecule
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Muon-catalyzed fusion was first observed in the pdμ system, and remains a good test of our understanding of the underlying molecular and nuclear processes. In contrast to the ddμ and dtμ systems, no resonant behavior is expected, which considerably simplifies the dynamics. We will discuss data taken with solid H-D mixtures of 0.05%, 2%, 15% and 75% D2. In these measurements we observed simultaneously muons from pdμ→μ+ 3He and γs from pdμ→μ 3He + γ. A simulation code incorporating the relevant physics processes has been developed for the analysis of this data. Preliminary results are presented for the fusion and molecular formation rates. This new data stringently tests the currently-accepted fusion scheme. A new value of the astrophysical S-factor is derived.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1012657124390
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    Paper (German National Licenses)
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  • 5
    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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    Paper (German National Licenses)
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  • 6
    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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    Paper (German National Licenses)
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  • 7
    Electronic Resource
    Electronic Resource
    Raman gain in liquid-core fibers (1974)
    Chichester [u.a.] : Wiley-Blackwell
    Journal of Raman Spectroscopy 2 (1974), S. 363-371 
    Details
    ISSN: 0377-0486
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The frequency dependence of the gain factor of stimulated Raman scattering was measured using tunable dye lasers as signal and pump light sources. In CCl4 and C2Cl4 peak gain factors of 1.3 × 10-9 cm/W and 1.7 × 10-9cm/W were obtained for the major Raman lines with a frequency shift of ν0 = 458 cm-1 and 447 cm-1, respectively. From the experimental gain factor a threshold power of 0.2 W was estimated for a liquid-core fiber filled with C2Cl4 (diameter 10 μm and length 1 km).
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jrs.1250020406
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    Paper (German National Licenses)
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