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  • 1
    Electronic Resource
    Electronic Resource
    Disktron accelerator (1993)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 64 (1993), S. 2466-2474 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A new type of low-energy ion accelerator has been developed. It includes an eight-storied Disktron generator, newly developed accelerating tubes which hold up to 4 MV/m, both single and tandem acceleration capability, and a compound negative ion source. The Disktron generates 3.2 MV with a dummy load and 2.2 MV with ion beams, and has a voltage stability better than 10−3 at around 1 MV with a corona feedback stabilizer or a generating voltmeter feedback stabilizer only. The highly stabilized voltage of the Disktron has particularly been allowed to form an ion microbeam of about 1-μm diameter.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1143905
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  • 2
    Electronic Resource
    Electronic Resource
    Influence of disorder on luminescence from pseudorandomized strained Si1−xGex/Si superlattices (1996)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 69 (1996), S. 3972-3974 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Carrier localization in a disordered potential was studied in type-I strained Si1−xGex/Si superlattices (SLs) where layer widths have been artificially pseudorandomized. The photoluminescence (PL) intensity under a transverse bias voltage varies monotonically and exhibits a folded increase as the bias is increased as opposed to an ordered SL where only steady drop-off of PL intensity, symmetric with respect to bias polarity, was observed with increasing field strength. The results indicate that electron and hole wave functions are located spatially apart at zero bias due to disorder-induced localization. We point out that such a wave-function displacement is even pronounced for type-II SL potentials in the presence of monolayer thickness fluctuation. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.117984
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  • 3
    Electronic Resource
    Electronic Resource
    Absence of Stark shift in strained Si1−xGex/Si type-I quantum wells (1996)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 68 (1996), S. 2097-2099 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Excitonic photoluminescence in a transverse electric field has been studied in strained Si1−xGex/Si type-I quantum wells (QWs) in the weak field regime. With increasing electric field, a steady blue-shift of the free exciton emission energies has been observed, thereby suppressing the anticipated downward shift due to a quantum confined Stark effect. It is revealed that a field-driven decrease of the exciton binding energies gives a good account of the experimental blue-shift for a wide range of well widths, which is also in good agreement with variational calculations. We also find that the extremely small conduction band offset characteristic of stained Si1−xGex/Si type-I QWs is responsible for the absence of the Stark red-shift and the mixed dimensionality. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.115596
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  • 4
    Electronic Resource
    Electronic Resource
    Microshear zones in a Miocene submarine dacite dome of southwest Japan (1993)
    Springer
    Bulletin of volcanology 55 (1993), S. 438-442 
    Details
    ISSN: 1432-0819
    Keywords: dome ; submarine ; dacite ; micro-structure ; groundmass ; Miocene ; Japan
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract Microscopic shear zones have been found in the groundmass of glassy rocks of a Miocene submarine dacite dome in southwest Japan. Similar textures have been reported previously but only in dykes. These textures give a valuable insight into the deformation of the dome during its emplacement by recording the orientations of the principal strains. Detailed textural analysis indicates that the microshear zones formed as a result of flattening and stretching of the magma simultaneously with quenching. Measured stretching directions are near-parallel suggesting the magma flowed in one dominant direction rather than in a radial pattern. The strain is believed to also be influenced by high magma pressure inside the dome being imposed on the high viscosity outer part of the dome.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00302003
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  • 5
    Electronic Resource
    Electronic Resource
    Effects of lead on annealing properties of cold-drawn copper wire (1991)
    Springer
    Journal of materials science 26 (1991), S. 3775-3779 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Cold-drawn copper wires were made by cold-drawing after hot-rolling tough pitch copper rods which had been pre-heated at 673–973 K. The wires were annealed at 293–673 K to study their annealing properties. The effects of pre-heating the hot-rolled tough pitch copper rods, including lead, on the recrystallization behaviour of the cold-drawn copper wires were investigated by tensile tests, electrical resistivity measurements and structural observations. The half-softening temperature of annealed cold-drawn copper wires decreased when the hot-rolled copper rods were pre-heated at 873 K before cold-drawing. This behaviour was attributed to separation of lead dissolved in the copper matrix which is known to lower the half-softening temperature.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01184970
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  • 6
    Electronic Resource
    Electronic Resource
    Ultra slow muons generated by laser resonant ionization of thermal muonium produced by 500‐MeV protons with hot tungsten (1997)
    Springer
    Hyperfine interactions 106 (1997), S. 237-244 
    Details
    ISSN: 1572-9540
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We report recent progress to date on the UT‐MSL/KEK “Ultra Slow Muon” project, in which thermal muonium (Mu) atoms are generated from the surface of a hot tungsten target placed at the primary 500 MeV proton beam line and resonantly ionized by intense u.v. lasers synchronized with the emission of the Mu. The positive muon ionization fragments are collected by electrostatic beam optics to form a beam of slow positive muons.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1012662512868
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  • 7
    Electronic Resource
    Electronic Resource
    Ultra-slow muon facility for advanced μSR studies (1994)
    Springer
    Hyperfine interactions 87 (1994), S. 1083-1089 
    Details
    ISSN: 1572-9540
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A concept, a construction and an account of commissioning experiments up to May 1993 are given for the recently completed ultra-slow positive muon facility at the pulsed muon facility of UT-MSL/KEK. The intense and ultra-slowμ + beam with an extremely small phase-space volume to be produced in this facility will open new muon sciences includingμSR studies on material surfaces.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02068508
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  • 8
    Electronic Resource
    Electronic Resource
    Evidence for muonium emission from an SiO2 layer on n-type Si and the positive muon state in Si (1991)
    Springer
    Hyperfine interactions 65 (1991), S. 1071-1080 
    Details
    ISSN: 1572-9540
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Evidence for the emission of slow muonium atoms from a 3.0-nm-thick SiO2 layer covered on an n-type Si is reported. Also, upon applying an rf-resonance technique at the muon frequency, a time-differential observation of a delayed state-change from muonium to diamagnetic muon at room temperature was observed. Combining results obtained by use of longitudinal field decoupling and transverse spin rotation methods, the conversion rate was estimated to be 5 to 10 μs−1. Both of the above results, namely the observation of the emission and state-change of muonium, suggest a process in which μ+ initially captures an electron from Si, then quickly converts to μ+ again during thermal diffusion in the Si towards the SiO2 layer. Within the oxide layer, muonium is again formed and subsequently is emitted from the SiO2 surface.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02397763
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  • 9
    Electronic Resource
    Electronic Resource
    Surface muon production in medium energy heavy ion reaction at RIKEN (1991)
    Springer
    Hyperfine interactions 65 (1991), S. 1159-1165 
    Details
    ISSN: 1572-9540
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A new type of beam transport system for secondary light charged particles (“Large Ω” Beam Course) has been constructed and used to transport surface muons from the decay of pions produced in heavy-ion reactions at RIKEN Ring Cyclotron (RRC). In an experiment carried out using a14N beam of 135 MeV/u and a carbon target of 0.9 g/cm2 thickness, the surface muon intensity obtained in 5×5 cm2 sample was around 100 1/s for 500 nA of the primary beam. This number may be increased by two orders if the energy were doubled.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02397774
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  • 10
    Electronic Resource
    Electronic Resource
    Muonium emission andreaction on platinum and gold powder surfaces revealed by MuSR (1993)
    Springer
    Hyperfine interactions 78 (1993), S. 333-337 
    Details
    ISSN: 1572-9540
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Muonium has been observed in powdered platinum (30 nm diameter) andgold (100 nm diameter), respectively, placed in vacuum by the muonium spin rotation (MuSR) technique at ambient temperature. Upon introducing gaseous oxygen up to 23 Torr into platinum powder, the muonium signal was eliminated, indicating that the observed muonium stays outside the platinum particles. The result on the platinum surface treated by hydrogen but exposed to oxygen gas suggests a reactive collision between muonium andoxygen adsorbed atomically on the surface.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00568158
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