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  • Articles  (3)
  • 07.65.Eh  (2)
  • Atomic and molecular collisions and interactions
  • Gas chromatography
  • 1985-1989  (3)
  • 1
    Electronic Resource
    Electronic Resource
    Improved resolution in VUV isochromat spectroscopy (1986)
    Springer
    Applied physics 40 (1986), S. 203-207 
    Details
    ISSN: 1432-0630
    Keywords: 07.65.Eh ; 79.60.-i
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract The energy resolution of a VUV isochromat spectrometer employing the traditional energy selective Geiger counter can be significantly improved. The variance of the optical resolution function with the usual CaF2 entrance window is (240 meV)2. With SrF2 we obtain (113 meV)2 at room temperature and (73 meV)2 at 70°C. A direct confirmation of these data, which were derived from a moment analysis of the threshold behaviour of an Au isochromat is provided by a measurement of image potential states at Cu(001).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00616595
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Resonance lonization mass spectroscopy with a pulsed thermal atomic beam (1987)
    Springer
    Applied physics 44 (1987), S. 339-345 
    Details
    ISSN: 1432-0630
    Keywords: 07.65.Eh ; 32.70.Fw ; 32.80.Dz
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract Resonance ionization mass spectroscopy (RIMS) and pulsed-laser induced desorption (PLID) have been combined for ultrasensitive detection and spectroscopy of very small samples of refractive elements. The method has been tested and applied to laser spectroscopy of 5×109 atoms (1.5 pg) of195Au (T 1/2= 183d) implanted at the ISOLDE online mass separator with 60 keV into graphite. A pulsed thermal atomic beam was formed by laser desorption with a 10 ns Nd∶Yag laser pulse. Subsequently the atoms were photoionized in a three-colour, three-step resonant excitation to an autoionizing state. The selectivity was enhanced by a time-of-flight measurement of the photo ions. In resonance, one ion was detected per 105 atoms implanted resulting in a gain in detection efficiency by three orders of magnitude in comparison to the use of a continuous atomic beam. In the course of the experiments several unknown autoionizing states were found, and the lifetime of the 6d 2 D 3/2 state of gold was determined to beτ=10.7(6) ns.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00624601
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  • 3
    Electronic Resource
    Electronic Resource
    Determination of soil fumigants in air using tandem capillary gas chromatography after charcoal trapping (1988)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 11 (1988), S. 106-110 
    Details
    ISSN: 0935-6304
    Keywords: Gas chromatography ; Tandem capillaries ; Charcoal trapping ; Soil fumigants ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Soil fumigants, like 1,3-dichloropropene and metham-sodium (forming methyl isothiocyanate) diffuse into the atmosphere, thus presenting a hazard to people in the surroundings. A method is described in which a large volume (50 μl) of extractant, used to desorb the compounds from charcoal, is injected into a GC, equipped with two capillary columns. By way of Deans switching, the solvent is separated from the compounds of interest. Modification of a GC sampler makes unattended analyses possible.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jhrc.1240110127
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