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Zeitlin ; R. Zimdar ; M. P. Zorzano Mier
    American Association for the Advancement of Science (AAAS)
    Published 2013
    Staff View
    Publication Date:
    2013-07-23
    Publisher:
    American Association for the Advancement of Science (AAAS)
    Print ISSN:
    0036-8075
    Electronic ISSN:
    1095-9203
    Topics:
    Biology
    Chemistry and Pharmacology
    Computer Science
    Medicine
    Natural Sciences in General
    Physics
    Published by:
    http://www.aaas.org/

    Latest Papers from Table of Contents or Articles in Press
  2. 2
    Shah, P. ; Biswas, A. ; Armstrong, R. L. ; Radziemski, L. J.

    [S.l.] : American Institute of Physics (AIP)
    Published 1990
    Staff View
    ISSN:
    1089-7550
    Source:
    AIP Digital Archive
    Topics:
    Physics
    Notes:
    Time-dependent intensities of the spectral lines emitted by laser-induced plasmas generated in several gases are presented. The time-resolved and spatially varying intensities of two once-ionized nitrogen lines were used to calculate radial temperature distribution of temperature within the plasma. A modified blast wave theory, in which ionization was included through the Saha equation and the equation of conservation of charge, was used to calculate time-dependent intensities of several spectral lines of C, N, He, and Ar. The temporal profiles of the spectral lines appear to be dependent on the ionization potentials of the species in the plasma.
    Type of Medium:
    Electronic Resource
    URL:
    http://dx.doi.org/10.1063/1.346285

    Articles: DFG German National Licenses
  3. 3
    Shah, P. ; Armstrong, R. L. ; Radziemski, L. J.

    [S.l.] : American Institute of Physics (AIP)
    Published 1989
    Staff View
    ISSN:
    1089-7550
    Source:
    AIP Digital Archive
    Topics:
    Physics
    Notes:
    The blast wave theory coupled with ionization described by the Saha equations and the charge conservation equation, are used to calculate the time-dependent, spatial distribution of the number densities of the different species of a plasma formed on a carbon surface. The temporal behavior of the normalized intensity profiles of the C i (247.8 nm) and C ii (251.1 nm) lines and the Stark shifts of the C i (247.8 nm) line from 0.1 to 0.4 μs are obtained. Good agreement is found between theoretical and experimental time-dependent, normalized, line intensity profiles and Stark shift profiles.
    Type of Medium:
    Electronic Resource
    URL:
    http://dx.doi.org/10.1063/1.342741

    Articles: DFG German National Licenses
  4. 4
    Loree, T. R. ; Radziemski, L. J.
    Springer
    Published 1981
    Staff View
    ISSN:
    1572-8986
    Keywords:
    Spectrochemistry ; laser-induced breakdown ; atomic detection ; spectroscopy ; coal gasification ; sodium detection ; potassium detection ; beryllium detection ; organophosphates
    Source:
    Springer Online Journal Archives 1860-2000
    Topics:
    Chemistry and Pharmacology
    Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Technology
    Notes:
    Abstract Spectral analysis of the plasma produced by laser-induced breakdown was demonstrated to be an effective real-time technique for the detection of atomic constituents in gases and gas-entrained particulates. The time-integrated technique, LIBS (laser-induced breakdown spectroscopy), was applied to the detection of sodium and potassium in a coal gasifier product stream, of airborne beryllium, and of phosphorus, sulfur, and chlorine in various organic molecules. In a companion paper (following) the time-resolved technique will be discussed.
    Type of Medium:
    Electronic Resource
    URL:
    http://dx.doi.org/10.1007/BF00568835

    Articles: DFG German National Licenses
  5. 5
    Radziemski, L. J. ; Loree, T. R.
    Springer
    Published 1981
    Staff View
    ISSN:
    1572-8986
    Keywords:
    Spectrochemistry ; laser-induced breakdown ; time-resolved spectroscopy ; chlorine detection ; phosphorus detection
    Source:
    Springer Online Journal Archives 1860-2000
    Topics:
    Chemistry and Pharmacology
    Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Technology
    Notes:
    Abstract We have added time resolution to laser-induced breakdown spectroscopy in two forms, by gating an optical multichannel analyzer (OMA) and by time-resolving the output of a photomultiplier with a boxcar amplifier. Spectra were obtained for temporal segments of 25 to 100 ns, from 25 ns to 50 µs after initiation of the breakdown. OMA spectra of oxygen illustrate the power of this technique for survey purposes. The photomultiplier-boxcar arrangement was used to detect phosphorus atoms from diisopropylmethyl phosphonate in air, and also to detect chlorine in air, both in real time. In the former experiments we detected 690 ppm (w/w) of phosphorus and project a limit of detection with our current apparatus of 15 ppm (w/w). For chlorine, we observed signal from 120 ppm (w/w) and project a limit of detection of 60 ppm (w/w).
    Type of Medium:
    Electronic Resource
    URL:
    http://dx.doi.org/10.1007/BF00568836

    Articles: DFG German National Licenses