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  • American Institute of Physics (AIP)  (2)
  • 1990-1994  (2)
  • 1980-1984
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  • 1990-1994  (2)
  • 1980-1984
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  • 1
    Electronic Resource
    Electronic Resource
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 101 (1994), S. 2091-2097 
    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
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  • 2
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Sputtered Co1−xPtx (x=0–0.14) alloy films have been studied by Brillouin scattering of spin waves and compared with results on Co/Pt/Co multilayered films. Brillouin spectra of the surface spin waves in the sputtered alloy films are remarkably broadened as an increase of the Pt content. The in-plane coercivity of the films also increases as the increase of the Pt content, which indicates larger and better oriented grains with proper separations that result from higher Pt content. The broadening of the spin-wave spectra is caused by the magnetic inhomogeneity due to the grains in the film. The exchange stiffness constant of the CoPt alloy films is determined from the magnetic field dependence of the frequency shifts of the surface and standing spin waves. To investigate the exchange interaction in the inhomogeneous alloy films, Co/Pt/Co multilayered films with the Pt interlayer of thickness of 0–40 A(ring) have been fabricated as a model material. From the analysis of the frequency shifts of the spin waves, the exchange interaction between Co layers through the Pt interlayer is evaluated.
    Type of Medium: Electronic Resource
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