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  • 1
    Electronic Resource
    Electronic Resource
    Fluorescence analysis and growth of BiSrCaCuO superconducting thin films
    Amsterdam : Elsevier
    Physica C: Superconductivity and its applications 235-240 (1994), S. 691-692 
    Details
    ISSN: 0921-4534
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0921-4534(94)91569-5
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  • 2
    Electronic Resource
    Electronic Resource
    ZnSe films deposited on crystalline GaAs and amorphous quartz substrates by means of pulsed laser ablation technique (2002)
    Springer
    The European physical journal 29 (2002), S. 541-545 
    Details
    ISSN: 1434-6036
    Keywords: PACS. 61.10.Eq X-ray scattering – 78.40.Fy Semiconductors – 78.55.Et II-VI semiconductors
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract: ZnSe films were deposited by pulsed laser ablation on a crystalline GaAs substrate and on an amorphous quartz substrate. The deposition process was performed with the same growth parameters. The films were investigated by means of X-ray diffraction, reflectance and photoluminescence spectroscopy. The X-ray diffraction spectra have demonstrated that the films grow in a highly oriented way but having different orientations, i.e. the films deposited on GaAs grow (100)-oriented and the films deposited on quartz grow (111)-oriented. Reflectance spectra as a function of the temperature have been analysed by means of the classical oscillator model, in order to obtain the temperature dependence of the band gap energy. This gives results comparable to those of ZnSe single crystals for ZnSe on GaAs, but it is red-shifted for ZnSe on quartz, because of lattice and thermal strains. The photoluminescence measurements at T = 10 K confirm the better quality of ZnSe deposited on GaAs and show that pulsed laser ablation is a promising technique to grow films having intrinsic luminescence even on an amorphous substrate.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1140/epjb/e2002-00337-0
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  • 3
    Electronic Resource
    Electronic Resource
    Indium and tin oxide polycrystalline thin films as NO gas sensors produced by reactive pulsed laser ablation and deposition (1999)
    Springer
    Applied physics 69 (1999), S. S675 
    Details
    ISSN: 1432-0630
    Keywords: PACS: 81.15.Fg; 81.05.-t; 73.61.Le
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract. Pulsed laser ablation is a very interesting method of depositing thin films of several materials and compounds, such as oxides, nitrides, insulators, semiconductors, and superconductors. Indium and tin oxide polycrystalline thin films have been grown on silicon (100) substrates by reactive PLD from two metallic targets of indium and tin by multilayered deposition, in the presence of oxygen, using a frequency-doubled Nd-YAG laser (λ=532 nm). The films produced have been studied to evaluate their use as NO gas sensors, and the best performance has been found by varying some important parameters, such as the substrate temperature and the pressure of oxygen in the deposition chamber. X-ray diffraction analysis of the deposited films shows that they are polycrystalline with a preferential (400) orientation. Electrical resistivity measurements, performed by using a four-point probe technique, show a sharp increase in resistivity when the films are exposed to NO. The electrical responses of tin oxide-indium oxide multilayered thin films are reported.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003390051503
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  • 4
    Electronic Resource
    Electronic Resource
    Surface modifications of carbide ceramics induced by pulsed laser treatments (1999)
    Springer
    Applied physics 69 (1999), S. S515 
    Details
    ISSN: 1432-0630
    Keywords: PACS: 82.80.Ch; 81.05.Je; 81.65.-b; 78.70.-g
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract. It is well known that sintered ceramics are very hard and difficult materials to process and machine by traditional methods. An easy and available solution seems to be a pulsed laser treatment, under appropriate experimental conditions (pulse duration and energy, radiation incidence angle, working atmospheres, etc.). In these experiments, in order to modify the structure and morphology of the surface, polycrystalline sintered SiC substrates were irradiated with an ArF (λ=193 nm,hν=6.4 eV,τ=30 ns) pulsed laser, at different fluences and at grazing incidence angle. Since it is well known that laser irradiation can produce both a dissociation of surface compounds and a high level of amorphisation (owing to very rapid cooling of melted material) different working atmospheres (Ar or O2 or CH4) and substrate heating (∼700 °C) have been used, with the aim of confining and controlling any chemical and physical transformation produced by laser-material interaction. Morphological and structural modifications have been studied by SEM/EDAX microscopy. Surface chemistry has been analysed by Raman spectroscopy. Changes in surface roughness have also been quantified by AFM microscopy.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003390051457
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  • 5
    Electronic Resource
    Electronic Resource
    Influence of Temperature on Nano-Graphene Structuring of PLD Grown Carbon Films - An X-Ray Diffraction Study (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Advances in science and technology Vol. 48 (Oct. 2006), p. 55-60 
    Details
    ISSN: 1662-0356
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Natural Sciences in General , Technology
    Notes: The physical properties of graphene nano-structures are highly anisotropic and generallycorrelated to the graphene sheet orientation. We investigated the capability to grow nano-graphenestructured carbon films and to control their texturing by pulsed laser ablation of a pyrolyticgraphite target (Nd:YAG laser, 2nd harmonic: λ=532 nm, hν=2.33 eV, τ=7 ns, ν=10 Hz, φ=7J/cm2), operating at different temperature conditions. Carbon films were deposited on Si 〈100〉substrates. Detailed characterisation by synchrotron X-ray measurements were performed onsamples deposited in vacuum (~10-3 Pa) at high substrate temperatures (〉800°C) and at roomtemperature followed by post-annealing at high temperature (〉800°C). The X-ray measurementsestablished the formation of nano-sized graphene structures for both sample sets. In the first set, thenano-particles are correlated among them, their size increases with substrate temperature and alongitudinal growth of parallel graphene layers occurs, with the ˆc axis parallel to the substrate. Inpost annealed sample set, on the contrary, the nano-particles size is smaller and depends weakly onannealing temperature. The graphene ˆc axis results to be randomly oriented up to ~850°C. Abovethis temperature it seems that a transition phase occurs and the c axis results to lie parallel tosubstrate plane
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/42/transtech_doi~10.4028%252Fwww.scientific.net%252FAST.48.55.pdf
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  • 6
    Electronic Resource
    Electronic Resource
    Structural characterization and properties of superconducting thin films produced by pulsed laser deposition
    Amsterdam : Elsevier
    Thin Solid Films 241 (1994), S. 114-118 
    Details
    ISSN: 0040-6090
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0040-6090(94)90409-X
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  • 7
    Electronic Resource
    Electronic Resource
    Properties and analysis of superconducting pellets and thin films of Bi-Sr-Ca-Cu-O material
    Amsterdam : Elsevier
    Applied Surface Science 79-80 (1994), S. 455-458 
    Details
    ISSN: 0169-4332
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0169-4332(94)90454-5
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  • 8
    Electronic Resource
    Electronic Resource
    THE SUN AS AN X-RAY STAR: OVERVIEW OF THE METHOD (1997)
    Springer
    Solar physics 172 (1997), S. 239-239 
    Details
    ISSN: 1573-093X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We present a method to study the solar-stellar connection, i.e., the close similarity of the physical phenomena occurring on the Sun and on late-type active stars, by taking advantage of Yohkoh/SXT X-ray images. From such images, we first generate distribution functions of the whole disk differential emission measure, and then synthesize from these spectra analogous to those collected by X-ray telescope instruments aimed at stars other than the Sun. Here we illustrate the application of this method to the ROSAT/PSPC and ASCA/SIS, and discuss test cases as well as future applications.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1004962623124
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  • 9
    Electronic Resource
    Electronic Resource
    Mutual conversion of (BiPb)2Sr2Ca n−1Cu n O x HTSCs withn=1, 2, 3: Temperature and oxygen partial-pressure dependence (1994)
    Springer
    Il nuovo cimento della Società Italiana di Fisica 16 (1994), S. 1701-1708 
    Details
    ISSN: 0392-6737
    Keywords: Superconducting perovskites and related structures ; Treatment of materials and its effects on microstructure and properties ; Conductivity phenomena in semiconductors and insulators ; Conference proceedings
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Summary The transformation of the 2223 (n=3) phase in the 2201 (n=1) phase by heating the sample in Ar atmosphere was studied. The subsequent cycling of the sample temperature and the oxygen enrichment of the gas phase convert the 2201 (n=1) phase in the 2223 (n=3) phase in the presence of the 2212 (n=2) and Ca2PbO4 compound. Thein situ resistivity measurements,T c values and XRD carried out on the sample confirm these phase changes. The experiment indicates that this process is oxygen dependent at low oxygen partial pressure.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02462163
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  • 10
    Electronic Resource
    Electronic Resource
    Satellite DNA sequences flank amplified DHFR domains in marker chromosomes of mouse fibrosarcoma cells (1994)
    Springer
    Genetica 94 (1994), S. 9-16 
    Details
    ISSN: 1573-6857
    Keywords: DHFR amplification ; fluorescencein situ hybridization ; marker chromosomes ; satellite DNA
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract This study centers on marker chromosomes carrying expanded chromosomal regions which were observed in two independent derivatives of the AA12 murine fibrosarcoma line, the 10−3 M MTX-res H2 and the 5×10−7 M MTX-res E. Previous characterization of the marker chromosomes of MTX-res variants showed their common derivation from a marker chromosome (m) of the parental line, endowed with two interstitial C-bands. Cytogenetic evidence pointed to one C-band ofm as the site involved in the chromosomal rearrangements leading to the HSR/ASR chromosomes. ISH of a3H-labeled satellite DNA probe allowed satellite sequences flanking the HSR/ASR in the marker chromosomes, where the C-band was no longer visible, to be detected. FISH experiments using biotinylated DHFR and satellite DNA probes showed that the respective target sequences are contiguous in new marker chromosomes. They also allowed inter- and intrachromosomal rearrangements to be seen at DHFR amplicons and satellite sequences. Double-color FISH using digoxygenated satellite DNA and biotinylated pDHFR7 showed that in a marker chromosome from the H2 cell line the two target sequences are not only adjacent, but closer than 3 Mb, as indicated by overlapping of the different fluorescence signals given by the two probes. Another marker chromosome in the E variant was shown to display a mixed ladder structure consisting of a head-to-head tandem of irregularly-sized satellite DNA blocks, with two symmetrical interspersed DHFR clusters.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01429215
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