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  • 1
    Electronic Resource
    Electronic Resource
    Magneto-optics of excitons in a center Si δ-doped GaAs/AlGaAs quantum well (1993)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 73 (1993), S. 8502-8505 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Observation of magneto-optical transitions in a Si center δ-doped quantum well is reported. The excitons are stabilized by the application of the field. With photoluminescence excitation spectroscopy (PLE), transitions below the Fermi level are observed. At magnetic fields (approximately-greater-than)8 T broadened Landau levels can be seen. The features in the PLE spectra sharpen up significantly when the Larmor diameter becomes less than the average interimpurity spacing. The effect of the ionized donors in the well on the optical spectra is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.353402
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  • 2
    Electronic Resource
    Electronic Resource
    Detection statistics of deep levels in minority carrier transient spectroscopy (1997)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 81 (1997), S. 251-259 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A theoretical treatment of the minority carrier transient spectroscopy (MCTS) experiment is presented. We have modeled the minority carrier flux through the depletion region of an illuminated Schottky diode held under reverse bias, and used these data to calculate the occupancy of minority carrier traps as a function of energy, capture cross section, and temperature. The model shows that the capacitance transient monitored in the MCTS experiment decreases in intensity as the temperature is raised. It is demonstrated that this causes inaccuracies in the measured deep level activation energy Ea derived from an Arrhenius plot of the data. Simulated MCTS spectra have been compared with measured MCTS spectra of hole emission from the gold donor in silicon, and very good agreement between modeled and experimental spectra is observed. The model explains the commonly observed phenomenon of a reduction in MCTS peak heights for increasing temperature, which is the opposite effect from that commonly observed in conventional deep level transient spectroscopy data. It is shown that the correct choice of rate window can significantly reduce errors in the measured value of Ea. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.363991
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  • 3
    Electronic Resource
    Electronic Resource
    Determination of mercury by a combustion technique using gold as a collector (1971)
    s.l. : American Chemical Society
    Analytical chemistry 43 (1971), S. 1511-1512 
    Details
    ISSN: 1520-6882
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ac60305a040
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  • 4
    Electronic Resource
    Electronic Resource
    Radiation-induced shrinkage of voids in molybdenum and TZM (1979)
    [s.l.] : Nature Publishing Group
    Nature 278 (1979), S. 728-729 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] High purity zone refined molybdenum2 and TZM, both in recrystallised condition, were irradiated in the Dounreay fast reactor to total neutron doses of 1.5, 3.5 and 8 x 1026 m"2 giving calculated damage levels of 7.5, 17.5 and 40 displacements per atom respectively. The highest dose specimens were ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/278728a0
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  • 5
    Electronic Resource
    Electronic Resource
    Mechanisms for radiation-induced shrinkage of voids (reply) (1979)
    [s.l.] : Nature Publishing Group
    Nature 280 (1979), S. 253-254 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] EVANS REPLIES-Krishan and Nandedkar correctly point out that negative swelling rates can arise in a situation where a fraction of the radiation-produced vacancies are effectively removed from the system in the form of vacancy loops. Their expression showing the importance of dislocation density is ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/280253b0
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  • 6
    Electronic Resource
    Electronic Resource
    Observations of a Regular Void Array in High Purity Molybdenum irradiated with 2 MeV Nitrogen Ions (1971)
    [s.l.] : Nature Publishing Group
    Nature 229 (1971), S. 403-404 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The molybdenum specimens used were single crystal disks produced from electron beam zone refined material, subsequently annealed near the melting point in high vacuum. This treatment produced crystals of very low dislocation density (~ 107 lines/cm2) and high resistivity ratio (R 293 K/R 4.2 K ~ ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/229403a0
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  • 7
    Electronic Resource
    Electronic Resource
    Formation of blisters in molybdenum bombarded with helium (1975)
    [s.l.] : Nature Publishing Group
    Nature 256 (1975), S. 299-300 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Molybdenum samples were irradiated at room temperature with 5X1017 18-keV helium ions per cm2, these ions having a projected range of approximately 630 A. Following bombardment the samples were electropolished using a backthinning technique to protect the front damaged surface so that this surface ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/256299a0
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  • 8
    Electronic Resource
    Electronic Resource
    Vacancy migration and void formation during annealing of electron irradiated molybdenum (1975)
    [s.l.] : Nature Publishing Group
    Nature 254 (1975), S. 685-686 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The first point concerns the well known stage III recovery occurring in molybdenum at between 150 and 300 C following either cold work1'2, neutron irradiation3'4, or electron irradiation5-6. That this recovery stage is caused by the annihilation of vacancies with interstitials is little disputed ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/254685a0
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  • 9
    Electronic Resource
    Electronic Resource
    A Phytoplankton Multi-Sampler and its Use in Lake Victoria (1961)
    [s.l.] : Nature Publishing Group
    Nature 191 (1961), S. 53-55 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] FROM April until August 1960, many phytoplank-ton samples were taken with a Ruttner sampler from the northern end of Lake Victoria, especially in the north-west corner of Pilkington Bay of Buvuma Island (Fig. 1). The main constituents of the phyto-plankton were Melosira nyassensis var. victoriae, ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/191053a0
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  • 10
    Electronic Resource
    Electronic Resource
    Value of a Simple Observational Technique for Determining the Fat Content of Algal Cells (1959)
    [s.l.] : Nature Publishing Group
    Nature 184 (1959), S. 1737-1738 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Since late 1957 attempts have been made to check the accuracy of the observational technique by biochemical methods and to repeat some of the earlier work. From a sample of Navicula pelliculosa (Breb.) Hilse, kindly given to me by Dr. G. E. Fogg of University College, London, pure, unialgal ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/1841737b0
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