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  • 1990-1994  (16)
  • 1985-1989  (5)
  • 1980-1984
  • 1994  (16)
  • 1987  (5)
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Publisher
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  • 1990-1994  (16)
  • 1985-1989  (5)
  • 1980-1984
Year
  • 1
    Electronic Resource
    Electronic Resource
    Studies on dynamics of Mu reaction with NO2 by muon spin resonance and relaxation techniques (1994)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 101 (1994), S. 2091-2097 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The reaction of Mu with NO2 in a Kr atmosphere was studied by muon spin resonance and relaxation measurements at 300 K. It was found that the reaction proceeds via the following two steps: Mu+NO2→MuO+NO and MuO+NO2→MuNO3. In particular, the final product MuNO3 and the intermediate species MuO were successfully detected for the first time by the techniques of the muon spin resonance and the longitudinal relaxation under a high magnetic field of ∼2800 G. The rate constants of the Mu+NO2 and the MuO+NO2 reactions were determined to be (2.9±0.5)×1011 l mol−1 s−1 and (4.5±0.1)×109 l mol−1s−1 at 300 K. The isotope effect in the rate constant of the Mu+NO2 reaction in comparison with the H+NO2 reaction suggests that there are reaction paths with a slight energy barrier which is high enough to retard the H reaction, but not the Mu reaction. On the other hand, the rate constant of the MuO+NO2 reaction is smaller than 50% of those of the OH+NO2 and the OD+NO2 reactions. This isotope effect seems to originate from faster rotational motion of MuO and/or lower vibrational density of states at the transition state.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.467716
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  • 2
    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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  • 3
    Electronic Resource
    Electronic Resource
    Theory of location and associated hyperfine properties of the positive muon in La2CuO4 (1994)
    Springer
    Hyperfine interactions 84 (1994), S. 87-103 
    Details
    ISSN: 1572-9540
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The current understanding regarding the location of the positive muon, which is a valuable tool for probing the magnetic properties of copper oxide superconducting systems, will be reviewed for La2CuO4. The results of our present investigations by the Unrestricted Hartree-Fock Cluster procedure, which leads to a location for the muon of about 1.08 Å away from an apical oxygen and with the O-μ+ direction making an angle of 25° with the O-Cu direction, will be discussed, including the magnitude and direction of the hyperfine field obtained from the calculated wave functions. These latter results, which are in reasonable agreement with earlier muon spin rotation data in powdered samples and recent data in single crystals, show the importance of including the local contact and dipolar contributions to the hyperfine field associated with the unpaired electron spin distribution in the neighborhood of the muon. Possible additional factors besides those included here, that will involve substantial computational efforts but could lead to a bridging of the remaining quantitative differences with experimental hyperfine data, will be discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02060647
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  • 4
    Electronic Resource
    Electronic Resource
    Muonium formation and migration in CsMgCl3 (1994)
    Springer
    Hyperfine interactions 84 (1994), S. 265-270 
    Details
    ISSN: 1572-9540
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The μ+SR were measured on CsMgCl3 single crystals to elucidate the muonium formation and migration in isostructural magnetic halides. More than 60% of incident μ+ were found to form muonium and the fraction of the muonium shows little temperature dependence. A part of muonium located near Mg2+ ions with zero nuclear dipole moments gives a fast relaxing component in the spectra. It was concluded from the decrease of asymmetry and the peak of the relaxation rate of the recovered asymmetry that muonium migrates above 90 K.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02060673
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  • 5
    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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  • 6
    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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  • 7
    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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  • 8
    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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  • 9
    Electronic Resource
    Electronic Resource
    Spin dynamics of the 2-dimensional ferromagnetism in the superlattice [MnSb/Sb] probed by positive muons (1994)
    Springer
    Hyperfine interactions 85 (1994), S. 151-157 
    Details
    ISSN: 1572-9540
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The spin dynamics of 2-dimensional ferromagnetic monolayers of [MnSb/Sb] were studied by theμ +SR method using pulsed sub-surface muons with a momentum of 18 – 25 MeV/c. A gradual growth of a static field along theμ + spin below 200 K and a divergent increase of the relaxation rate at around 25 K were observed in the 1 monolayer sample, related to the critical fluctuations in this magnetic superlattice.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02069415
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  • 10
    Electronic Resource
    Electronic Resource
    μSR studies on polyacetylenes (1987)
    Springer
    Hyperfine interactions 35 (1987), S. 755-759 
    Details
    ISSN: 1572-9540
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Positive muons were injected into both cis- and trans-polyacetylenes. From the various μSR measurements, the μ+ was found to form a radical state with an unpaired electron localized near μ+ in cis-polyacetylene, while in trans-polyacetylene it was found to be in a diamagnetic state. Combined with the observed H−1/2 dependence of the μ+ relaxation rate on the applied longitudinal field H in trans-polyacetylene, it was explained by the formation of soliton in trans-polyacetylene. Also the radical state was found to become unstable in iodine-doped polyacetylenes. An explanation is given with respect to the soliton model.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02394488
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