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  • Springer  (8)
  • 1990-1994  (8)
  • 1994  (8)
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Publisher
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  • 1990-1994  (8)
Year
  • 1
    Electronic Resource
    Electronic Resource
    Positive muons in [Co(NH3)6]Cl3 and [Co(ND3)6]Cl3 (1994)
    Springer
    Hyperfine interactions 84 (1994), S. 517-520 
    Details
    ISSN: 1572-9540
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We have carried out μSR experiments on [Co(NH3)6]Cl3 and [Co(ND3)6]Cl3. At 293 K, all the muons implanted into the complexes were in the diamagnetic state. The observed Gaussian-type muon spin relaxation function proved that the internal magnetic field was caused by nuclear dipole moments of the atoms in the complexes. In addition, another exponential-type muon spin relaxation function was observed in [Co(ND3)6]Cl3 below 50 K.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02060702
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  • 2
    Electronic Resource
    Electronic Resource
    Redox reaction of μ−O in water determined by the chemical shift (1994)
    Springer
    Hyperfine interactions 87 (1994), S. 929-934 
    Details
    ISSN: 1572-9540
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The chemical shift ofμ −O in water, ice and in aqueous hydrogen peroxide (H2O2) was examined using μ−O resonance. Two distinct signals are obtained in water and ice. Usingμ + resonance signal as a standard, the observed shiftsδg are −7.0×10−4 (signal A) and −12.1×10−4 (signal B) respectively. The intensity of the two fractions are almost equivalent in water; however, in ice, the intensity of signal B decreases with increase of signal A. After the addition of hydrogen peroxide to the water signal B disappears, A increases, and the total amplitude is increased.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02068485
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  • 3
    Electronic Resource
    Electronic Resource
    Relaxed excited states and anomalous hyperfine structure of muonium centers in KBr (1994)
    Springer
    Hyperfine interactions 84 (1994), S. 271-277 
    Details
    ISSN: 1572-9540
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We report on the luminescence induced by positive muons implanted (with 4 MeV) into KBr crystal, which evidences a long-lived (lifetime=13.3 μs excited state produced by muon radiolysis. The temperature dependence of the luminescence yield has a strong correlation with the amplitude of an “anomalous” muonium center: both are observed only below ∼50 K. This correlation strongly suggests that the muonium center is perturbed by the muon-induced excitons to cause the anomalous hyperfine structure. Moreover, the luminescence energy and decay time indicate that the observed luminescence is not associated with the intrinsic or impurity-related self-trapped excitons, but with a relaxed excited state specific to the muon(ium)-KBr system.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02060674
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  • 4
    Electronic Resource
    Electronic Resource
    Dynamics of muons in the ferroelectric material KDP (1994)
    Springer
    Hyperfine interactions 85 (1994), S. 85-90 
    Details
    ISSN: 1572-9540
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Muon spin relaxation in zero field and longitudinal field was measured in single crystal samples of KH2PO4 (KDP) and KD2PO4 (DKDP) over a temperature range of 5 K to 300 K. At low temperatures, diamagnetic muons and muon substituted radicals with nuclear hyperfine coupling can be observed. For both KDP and DKDP, a minor change was observed in the dynamics of the muon below 140 K. Above 140 K, the mobility of the muon appears to increase and the diffusion rate becomes faster with increasing temperature. Only a small increase in the relaxation rate is observed in KDP due to the presence of theH +, suggesting that the relaxation effects probably originate from the31P.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02069406
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  • 5
    Electronic Resource
    Electronic Resource
    A study of diamagnetic muon bonding in α-quartz using muon spin resonance (1994)
    Springer
    Hyperfine interactions 86 (1994), S. 753-759 
    Details
    ISSN: 1572-9540
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Diamagnetic muon spin resonance experiments were carried out in a-quartz at two temperatures: 300 K and 130 K. A strong diamagnetic resonance peak was observed at both temperatures. The spectrum exhibits an anisotropy in the chemical shift of 15 ppm (300K) and 25 ppm (130K).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02068975
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  • 6
    Electronic Resource
    Electronic Resource
    μ+SR study of Ising spin-glass Fe0.5Mn0.5TiO3 (1994)
    Springer
    Hyperfine interactions 84 (1994), S. 105-108 
    Details
    ISSN: 1572-9540
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A typical Ising spin-glass Fe0.5Mn0.5TiO3 has been investigated by μ+ spin relaxation measurements. It is found that the local magnetic fields at the μ+ stopping sites appear at a temperature twice as high asT SG. The directional distribution of the local magnetic fields is nearly isotropic, indicating the existence of the transverse spin components. It is clearly demonstrated that the spins fluctuate belowT SG and even at ∼4 K. Taking into account the results obtained by other methods, the main part of the fluctuations is inferred to be due to the transverse spin components and the fluctuation limes at ∼4 K are driven into a range between ∼10−5 and ∼10−7 s.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02060648
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  • 7
    Electronic Resource
    Electronic Resource
    Quantum diffusion of muonium in GaAs with shallow donor impurities (1994)
    Springer
    Hyperfine interactions 85 (1994), S. 79-84 
    Details
    ISSN: 1572-9540
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Muonium diffusion was studied in silicon doped GaAs by means of muon spin relaxation in a longitudinal field. The muonium hopping frequencies in two samples with n-type carrier concentration of 1012∼14 cm−3 and 8×1016 cm−3 were deduced by using the model of fluctuating effective local fields. We found that muonium diffusion is strongly influenced by the dilute Si impurity in both samples in the temperature range belowT Δ≃30K. The absence of such a behavior in compensated high-resistivity samples indicates that the presence of shallow donor levels plays a decisive role for the tunneling diffusion of muonium in semiconductors.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02069405
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  • 8
    Electronic Resource
    Electronic Resource
    Positive muons in spin-crossover complex [Fe(NCS)2(phen)2] (1994)
    Springer
    Hyperfine interactions 84 (1994), S. 477-481 
    Details
    ISSN: 1572-9540
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Diamagnetic muon species in a spin-crossover complex diisothiocyanatobisphenanthrolineiron(II) were investigated: two species with different spin relaxation functions and rates were observed over the range from 21 to 293 K. The sum of their yields changed at about the spin transition temperature of the complex, where the spin state of the complex changes from paramagnetic to diamagnetic when it is cooled down across the temperature. The results suggest that paramagnetic muon species could exhibit diamagnetic muon-like μSR signals in paramagnetic environment.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02060697
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