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  • 11
    Electronic Resource
    Electronic Resource
    Muon study of the intermetallic hydrides Zr2NiH x (1991)
    Springer
    Hyperfine interactions 64 (1991), S. 657-663 
    Details
    ISSN: 1572-9540
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Zero-field μSR experiments have been carried out in crystalline and amorphous hydrides of Zr2Ni using the pulsed muon beam available at the Rutherford Appleton Laboratory. The main result of this study is the fact that the motion of the muon relative to the protons (hydrogen) appears to be significantly slower than the hydrogen motion observed by181Ta PAC or1H NMR. An explanation of this paradoxical effect is suggested.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02396201
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  • 12
    Electronic Resource
    Electronic Resource
    Longitudinal muon spin relaxation in the organic metal polypyrrole (1991)
    Springer
    Hyperfine interactions 65 (1991), S. 847-853 
    Details
    ISSN: 1572-9540
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Longitudinal and zero field measurements of the muon spin relaxation function are reported for muons implanted in the conducting polymer polypyrrole. The observed muon relaxation can be accounted for by interaction with polaron excitations in the conducting polymer. Evidence is found for polaron localisation at temperatures below ∼ 50 K. The temperature dependence of the polaron mobility derived from the muon data is consistent with direct electrical conductivity measurements.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02397737
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  • 13
    Electronic Resource
    Electronic Resource
    Muon addition to nitrogen, oxygen and other atoms: Considerations for level crossing resonance studies (1991)
    Springer
    Hyperfine interactions 65 (1991), S. 987-992 
    Details
    ISSN: 1572-9540
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The purpose of this note is to examine the conditions under which muon level crossing resonance with quadrupolar nuclei may be used to characterise the elusive diamagnetic fraction which is formed when positive muons are stopped in various media and associated chemically with the host molecules. A potential difficulty is identified for nuclei having integral spin, which may explain why cross polarisation to14N has not yet been detected. The general suitability of nuclei with half-integral spin (I≥3/2) is illustrated with the case of17O, and suggestions are made for future studies with other nuclei, including species such as molecular ions and defect complexes (muon-impurity pairs).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02397754
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  • 14
    Electronic Resource
    Electronic Resource
    Level crossing resonance in ice: Identification of two diamagnetic muon states (1994)
    Springer
    Hyperfine interactions 86 (1994), S. 747-752 
    Details
    ISSN: 1572-9540
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Level crossing resonance studies of ice, doped with HF and NH3 to enhance and suppress the concentration of orientational defects, support the hypothesis that muons can trap at such defects to form complexes of the type H2O-Mu+-OH2. The doping alters the partition of the total diamagnetic fraction between this state, which is stable against charge migrationvia proton rearrangement at low temperature, and the neutral HMuO state, the isotopically substituted water molecule.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02068974
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  • 15
    Electronic Resource
    Electronic Resource
    Structures and isotope effects of fullerene hydrides (1994)
    Springer
    Hyperfine interactions 86 (1994), S. 779-788 
    Details
    ISSN: 1572-9540
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A summary account is given of various aspects of the structure and spin density distribution for the different isotopomers of C60X (X=H, Mu) and for the different isomers of C70Mu. The rigidity of the C60X structure is exploited in describing the origin of the zero point hyperfine isotope effect.Ab initio Hartree-Fock calculations suggest that the deformation to the C60 cage is highly localised and emphasizes the alkene nature of C60. Addition of muonium to C70 results in 5 possible structures for C70MU, 3 with alkene and 2 with arene character.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02068977
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  • 16
    Electronic Resource
    Electronic Resource
    Muon and positron induced luminescence in KBr and CuCl (1994)
    Springer
    Hyperfine interactions 87 (1994), S. 991-996 
    Details
    ISSN: 1572-9540
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The exciton luminescence induced by muon implantation in two selected halides is compared with that induced by positron irradiation. The data include wavelength and lifetime spectra for potassium bromide and lifetime spectra for cuprous chloride, recorded at the ISIS Pulsed Muon Facility. For each material, the spectra for positron-induced and muon-induced luminescence are indistinguishable; that is, no influence of muonium formation on the self-trapped exciton state can be discerned.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02068495
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  • 17
    Electronic Resource
    Electronic Resource
    Quantum Diffusion in Cryocrystals Studied by Muon Spin Relaxation (1998)
    Springer
    Journal of low temperature physics 111 (1998), S. 303-319 
    Details
    ISSN: 1573-7357
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We review our recent studies of muonium diffusion in cryocrystals. Atomic muonium (Mu = μ + e − ) may be considered as a light isotope of hydrogen and so provides the prototypical light interstitial defect in these sytems, themselves the simplest of insulators. Experiments using the muon spin relaxation techniques in transverse and longitudinal (zero) magnetic fields reveal tunneling motion at low temperatures, governed by various mechanisms of phonon scattering. The results are compared with the current theories of quantum diffusion in insulators. A two–phonon scattering mechanism is found to dominate at low temperatures in solid nitrogen, methanes and carbon dioxide, whereas a one–phonon interaction provides the main channel at temperatures comparable to the Debye temperature in solid nitrogen, xenon and krypton. Particular attention is devoted to quantum diffusion processes in the presence of static crystal disorder. At low temperatures, the muonium diffusion can no longer be described in terms of a single correlation time. The localization and delocalization effects in the Mu diffusion in such inhomogeneous crystals are discussed in detail. Finally, the authors give an analysis of trapping phenomena for muonium in insulators.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1022275317457
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  • 18
    Electronic Resource
    Electronic Resource
    The positive muon as a tracer for the study of metal hydrogen systems (1984)
    Springer
    Hyperfine interactions 17 (1984), S. 261-266 
    Details
    ISSN: 1572-9540
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We present the first systematic study of dynamic muon H-correlations in a metal hydride (NbH x ) over a large range of H concentrations. The following observations were made: (i) H loading shifts the motional narrowing range for muons in Nb from 60 K to above 170 K; (ii) inβ-NbH x muon (τμ) and H correlation times are of the same order but the corresponding activation energies are distinctly different; (iii) the concentration dependence of τμ −1 exhibits strong negative deviations from a (1-c) behavior; (iv) the H/D isotope effect inβ-NbH(D)0.92 is distinctly non-classical; (v) the ordering of vacancies in the subhydrides suppresses long range muon motion. The experimental features are interpreted in the framework of tracer diffusion theory and bear clear evidence that repulsive muon-H interactions are an important feature of the dynamic muon hydrogen correlations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02065912
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  • 19
    Electronic Resource
    Electronic Resource
    PulsedμSR and the measurement of Zeeman and Dipolar relaxation times (1984)
    Springer
    Hyperfine interactions 19 (1984), S. 953-958 
    Details
    ISSN: 1572-9540
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Pulsed muon sources are ideally suited to experiments which require a repetitive or periodic excitation of the sample. Various possibilities are discussed. Magnetic relaxation is considered in terms of the various thermodynamic reservoirs which make up a spin system, both for nuclear magnetism and for electronic paramagnetism. A synchronous pulse sequence is presented which, in a single experiment, allows the following distinct relaxation functions of the samples host spin system to be determined: that of its Zeeman energy, that of its secular dipolar components, and that of the total dipolar energy in zero field. The timescale of the high field measurements overlaps with and substantially extends the range accessible to NMR and ESR.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02066142
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  • 20
    Electronic Resource
    Electronic Resource
    A pulsed surface muon beam andμSR facilities proposed for the UK (1984)
    Springer
    Hyperfine interactions 19 (1984), S. 945-951 
    Details
    ISSN: 1572-9540
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The Spallation Neutron Source, SNS, under construction in the United Kingdom offers the possibility of an intense pulsed pion or muon source and aμSR facility for condensed matter spectroscopy has been proposed. A design and specification is presented for a pulsed surface muon beam. Features include negligible electron contamination, the possibility of rotating the polarisation and — particularly important — the capability of varying the pulse width. Operation with cloud muons of both charge signs up to 70 MeV/c and with pions up to 200 MeV/c would also be possible. The pulsed nature of the source would allow the full muon intensities to be used forμSR experiments. The potential performance is such that an optimised facility would increase the world total muon stop rate for conventional time-differentialμSR by an order of magnitude. The majority ofμSR applications would benefit simply from the increased intensity, some benefit especially from the frame-length and duty cycle. Emphasis is to be placed on longitudinalμSR, on the development of RF techniques (particularly for chemical applications) and onμSR in conjunction with synchronous pulsed excitation of the sample. A scheme for the excitation of a certain bandwidth within a high frequencyμSR spectrum, to display individual spectral lines for instance, is proposed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02066141
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