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  • 1
    Electronic Resource
    Electronic Resource
    Study of electroless Au film deposition on ZnCdTe crystal surfaces (1995)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 77 (1995), S. 3134-3137 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The "electroless'' deposition method of Au thin films on n-type ZnCdTe crystal surfaces has been investigated by atomic force microscopy, x-ray photoelectron spectroscopy, and low temperature photoluminescence. The blocking contact behavior of these films was strongly dependent on post deposition annealing treatments which were also found to induce modifications in the surface morphology and surface chemical composition. Heat treatments (at 300 °C) in vacuum eliminates most of the interfacial tellurium oxide introduced during the deposition. Annealing also reduces the radiative recombination at defects in the region below the interface and increases the barrier height of the contact. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.358666
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  • 2
    Electronic Resource
    Electronic Resource
    Infrared to visible upconversion in Er3+-doped-lead-germanate glass: Effects of Er3+ ion concentration (1995)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 77 (1995), S. 4688-4692 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The upconversion mechanism of Er3+ ions has been studied for lead-germanate glasses containing Er2O3 concentrations from 0.1 mol % to 2 mol %. Intense green emission was observed at room temperature due to 4S3/2→4I15/2 transition excited by a cw near-infrared laser beam at 797 nm. This green emission shows a similar intensity for samples with different Er3+ ion concentrations. A weak blue emission of 410 nm originating from the 2H9/2→4I15/2 transition was also observed. This blue emission and a red emission from the 4F9/2 level increase with the increase in Er3+ ion concentration. The bright green emission is attributed to the excited level absorption while the blue emission is due to a third step excitation where energy transfer between excited ions owing to their Coulomb interaction plays a key role. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.359436
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  • 3
    Electronic Resource
    Electronic Resource
    Investigation of nucleation and growth processes of diamond films by atomic force microscopy (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 76 (1994), S. 4099-4106 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The nucleation and growth of plasma-enhanced chemical-vapor deposited polycrystalline diamond films were studied using atomic force microscopy (AFM). AFM images were obtained for (i) nucleated diamond films produced from depositions that were terminated during the initial stages of growth, (ii) the silicon substrate-diamond film interface side of diamond films (1–4 μm thick) removed from the original surface of the substrate, and (iii) the cross-sectional fracture surface of the film, including the Si/diamond interface. Pronounced tip effects were observed for early-stage diamond nucleation attributed to tip convolution in the AFM images. AFM images of the film's cross section and interface, however, were not highly affected by tip convolution, and the images indicate that the surface of the silicon substrate is initially covered by a small grained polycrystalline-like film and the formation of this precursor film is followed by nucleation of the diamond film on top of this layer. X-ray photoelectron spectroscopy spectra indicate that some silicon carbide is present in the precursor layer.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.358496
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  • 4
    Electronic Resource
    Electronic Resource
    Low-temperature photoluminescence of detector grade Cd1−xZnxTe crystal treated by different chemical etchants (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 80 (1996), S. 3509-3512 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Low-temperature photoluminescence (PL) spectra of detector grade Cd1−xZnxTe (x=0.1) have been measured to obtain information about shallow level defect concentration introduced during mechanical polishing and chemical etching processes. We present here a comparative PL study of Cd0.9Zn0.1Te crystals treated by different chemical solutions used for nuclear detector surface treatment. The results show that the 5% Br–MeOH+2%Br–20% lactic acid in ethylene glycol treatment combines the advantages of bromine and lactic acid for chemical etching and results in the best surface condition, as evidenced by the largest I(D0,X)/Idef intensity ratio and the narrowest full width at half-maximum of the main peak (D0,X). Changes in the surface morphology were also analyzed by atomic force microscopy and correlated with the PL results. Current–voltage (I–V) curves and the room-temperature 55Fe spectral response of the sample etched by the best treatment are also presented and discussed. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.363222
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  • 5
    Electronic Resource
    Electronic Resource
    Production of poly-(β-hydroxybutyrate) from saponified Vernonia galamensis oil by Alcaligenes eutrophus (1998)
    Springer
    Journal of industrial microbiology and biotechnology 21 (1998), S. 46-50 
    Details
    ISSN: 1476-5535
    Keywords: Keywords: Alcaligenes eutrophus; biodegradable plastics; poly(β-hydroxybutyrate); vegetable oil; Vernonia galamensis; vernolic acid
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Saponified vernonia oil was converted exclusively to poly(β-hydroxybutyrate) (PHB) by Alcaligenes eutrophus in a single-stage batch culture. After harvesting, centrifugation followed by lyophilization, the resulting dried cells contained up to 42.8 wt% PHB having a peak molecular mass of 381 863 Da, weight-average molecular mass of 308 390 Da, and a polydispersity of 1.1. The PHB had a melting point (Tm) range of 163–174°C with a maximum at 172°C (lit. Tm, 175°C), and heat of fusion of 18.43 cal g−1. Fermentation performed under varying conditions of nitrogen limitation indicated that there was no significant effect of nitrogen concentration on the molecular mass of PHB produced from vernonia oil by A. eutrophus.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/sj.jim.2900555
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  • 6
    Electronic Resource
    Electronic Resource
    Gamma-gamma directional correlation study in92Zr (1978)
    Springer
    The European physical journal 285 (1978), S. 31-32 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The gamma-gamma directional correlation of the 2+′-2+-0+, 913(Iγ=1.69)-934(Iγ =100)keV cascade in92Nb decay has been investigated with a NaI-Ge(Li) system. Our results yieldδ=−0.013 −0.024 +0.041 . This is one of a very few cases where the second 2+ to first 2+ transition is not predominatelyE2. This may be related to the closed neutron shell, as earlier suggested. [Radioactivity92Zr; measuredγ-γ(θ), deducedδ]
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01410219
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