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  • Articles  (19)
  • Analytical Chemistry and Spectroscopy  (17)
  • flux pinning  (2)
  • 1990-1994  (19)
  • Physics  (19)
  • 1
    Electronic Resource
    Electronic Resource
    Vibrating reed study of the flux line dynamics of κ-(ET)2Cu[N(CN)2]Br (1994)
    Springer
    Journal of superconductivity 7 (1994), S. 793-797 
    Details
    ISSN: 1572-9605
    Keywords: Vibrating reed ; type-II superconductors ; organic superconductors ; flux pinning ; vortex lattice melting
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract Vibrating reed measurements were performed on single-crystal samples ofκ-(ET)2- Cu[N(CN)2]Br in an applied magnetic fieldH oriented either parallel (“longitudinal”) or perpendicular (“transverse”) to the highly conducting ac-plane. Field-cooling data taken for the longitudinal orientation andH〈0.7 T revealed a peak with a low-temperature shoulder in the reed dissipation 1/Q located at temperatureT Q below the superconducting transition temperatureT c (≈11.6 forH=0). The shoulder disappeared nearH≈0.7 T, accompanied by an abrupt change in the slope ofT Q (H), corresponding to a similar change in the slope of the upper critical magnetic fieldH c2 measured by Kwoket al. The existence of the shoulder in the dissipation peak bears on a number of current explanations for the exotic superconducting properties ofκ-(ET)2Cu[N(CN)2]Br.T Q data taken for the transverse orientation fell far below estimates ofH c2., indicating the existence of a substantial region of flux line (FL) mobility belowH c2(T). The location of a peak in NMR relaxation observed by De Sotoet al. lies close toT Q for the transverse orientation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01320871
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  • 2
    Electronic Resource
    Electronic Resource
    Vibrating reed study of the flux line dissipation of ceramic and single-crystal (Ba, K)BiO3 (1994)
    Springer
    Journal of superconductivity 7 (1994), S. 835-839 
    Details
    ISSN: 1572-9605
    Keywords: Vibrating reed ; type-II superconductors ; oxide superconductors ; flux pinning ; vortex lattice melting
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract Vibrating reed (VR) and dc and ac magnetic susceptibility measurements were performed on a nominal single crystal of composition (Ba0.64K0.36)BiO3 in an applied magnetic fieldH. Field-cooling and field-sweep data revealed multiple peaks in the reed dissipation 1/Q located below the superconducting transition temperatureT c (≈29.6 K forH=0). A shoulder or onset (with increasingT) of dissipation appears forT≤18 K, which may be a signature of a flux lattice melting transition. VR data for dense ceramic samples of composition (Ba0.625K0.375)BiO3 (T c=28.6K) exhibit a relatively narrow and smooth peak in 1/Q that corresponds well to a broad, intermediate-temperature peak in the crystal data. Resistivity experiments demonstrate that the single ceramic peak occurs well below the temperature at which the electrical resistanceR≈0, suggesting that the higher-temperature crystalline peaks are positioned close to the upper critical field line and may be strongly dependent upon grain size or surface properties. Both ac and dc susceptibility data show no clear evidence for multiple phases or gross compositional inhomogeneities in the crystalline sample. Our results demonstrate that the VR technique is an extremely sensitive method to probe sample inhomogeneities and their role in flux pinning phenomena.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01320879
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  • 3
    Electronic Resource
    Electronic Resource
    Matrix-assisted laser desorption ionization Fourier-transform mass spectrometry (1994)
    New York, NY : Wiley-Blackwell
    Rapid Communications in Mass Spectrometry 8 (1994), S. 498-500 
    Details
    ISSN: 0951-4198
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/rcm.1290080615
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  • 4
    Electronic Resource
    Electronic Resource
    Fragment pathway analysis using automated tandem mass spectrometry on an ion-trap mass spectrometer (1990)
    New York, NY : Wiley-Blackwell
    Rapid Communications in Mass Spectrometry 4 (1990), S. 103-107 
    Details
    ISSN: 0951-4198
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: A “key-sequence” procedure is presented for the automated tandem mass spectrometric analysis of compounds on a Finnigan ion-trap mass spectrometer. This allows fragmentation pathways of a range of masses or even a complete spectrum to be prepared automatically, obviating the tiresome preparation and optimization of individual scan-editor files. The procedure is limited by the speed of the driving computer; an “IBM-AT”, for example, permits more than 10 mass units to be scanned per minute. It is calibrated with perfluorotributylamine and methyl stearate is used to demonstrate its results. The Finnigan ion-trap “programming option” is necessary for implementation of the procedure.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/rcm.1290040403
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  • 5
    Electronic Resource
    Electronic Resource
    Study of oxygen peak shifts among some minerals using a tungsten-silicon multilayer pseudo-crystal (1991)
    New York, NY [u.a.] : Wiley-Blackwell
    X-Ray Spectrometry 20 (1991), S. 89-90 
    Details
    ISSN: 0049-8246
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: A study of oxygen Kα peak shifts using an electron probe microanalyzer with a W-Si multilayer pseudo-crystal (2d = 59.8 Å) shows a significant peak shift (0.024-0.043 Å) between simple oxide minerals (e.g. quartz) and minerals containing complex oxygen radicals (e.g. SO42-, CO32- and PO43-). The peak shift of the complex oxygen radicals toward the lower wavelength (or higher energy) side of the simple oxides may indicate a relatively stronger bonding energy inside these radicals than that of the simple cation - oxygen bond. In the direct determination of oxygen, a peak count reduction could occur as a result of this peak shift effect if unsuitable oxygen standards are used.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/xrs.1300200209
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  • 6
    Electronic Resource
    Electronic Resource
    Carbon Kα peak shift study using an electron probe microanalyzer with a vanadium-carbon multilayer pseudo-crystal (1992)
    New York, NY [u.a.] : Wiley-Blackwell
    X-Ray Spectrometry 21 (1992), S. 191-192 
    Details
    ISSN: 0049-8246
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: A study of carbon Kα peak shifts using an electron probe micronalyzer (EPMA) with a vanadium-carbon multilayer pseudo-crystal (2d = 96 Å) shows a distinct peak shift between diamond and graphite and two organic carbon phases (asphaltene and vitrinite). The peak shift reflecting the difference in carbon-to-carbon bonding types and structures shows that the carbon electron binding energy of diamond is higher than that of graphite, asphaltene and vitrinite. The relative electron binding energies of these phases obtained from the EPMA study were confirmed by ESCA (electron spectroscopy for chemical analysis) data.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/xrs.1300210408
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  • 7
    Electronic Resource
    Electronic Resource
    Editorial (1990)
    Chichester [u.a.] : Wiley-Blackwell
    Journal of Raman Spectroscopy 21 (1990), S. 1-1 
    Details
    ISSN: 0377-0486
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jrs.1250210102
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  • 8
    Electronic Resource
    Electronic Resource
    Editorial (1990)
    Chichester [u.a.] : Wiley-Blackwell
    Journal of Raman Spectroscopy 21 (1990), S. 767-767 
    Details
    ISSN: 0377-0486
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jrs.1250211202
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  • 9
    Electronic Resource
    Electronic Resource
    CARS vibration-rotation Q-branch spectrum of hydrogen chloride (1991)
    Chichester [u.a.] : Wiley-Blackwell
    Journal of Raman Spectroscopy 22 (1991), S. 467-471 
    Details
    ISSN: 0377-0486
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The self-broadening of the Q-branch vibration-rotational lines in the CARS spectrum of HCl was studied over the pressure range 0.002-1.000 bar and the temperature range 298-1048 K. The broadening coefficients, σp, are dependent on J at 298 and 550 K but are independent of J at higher temperatures; the σp value of 1048 K is only about 25% of its value for Jmax at 298 K.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jrs.1250220808
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  • 10
    Electronic Resource
    Electronic Resource
    Editorial (1991)
    Chichester [u.a.] : Wiley-Blackwell
    Journal of Raman Spectroscopy 22 (1991), S. 481-481 
    Details
    ISSN: 0377-0486
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jrs.1250220902
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