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  • 32.80.Dz  (2)
  • 07.65  (1)
  • 21.10.Ft  (1)
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  • 1
    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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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Resonance ionization mass spectroscopy for trace analysis of neptunium (1993)
    Springer
    Applied physics 56 (1993), S. 275-280 
    Details
    ISSN: 1432-0649
    Keywords: 32.30.—r ; 32.80.Rm ; 32.80.Dz ; 35.10.Hn
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Resonance ionization mass spectroscopic (RIMS) measurements for trace analysis and spectroscopy of 237Np, the ecologically most important isotope of neptunium, are described. The chemical procedure for the separation of neptunium from aqueous samples as well as the preparation of filaments for RIMS are outlined. Several two- and three-step excitation schemes have been investigated in order to find suitable conditions for the sensitive detection of 237Np. Using a three-step, three-color excitation and ionization scheme an overall detection efficiency of 3×10−8 was obtained, resulting in a detection limit of 4×108 atoms (160 fg) of 237Np. The hyperfine structure splittings of the levels under investigation, which influence the detection limit, were measured. A new method to determine the first ionization potential (IP) was applied to neptunium yielding a value of IP=6.2655(2) eV.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00325216
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Trace detection of plutonium by three-step photoionization with a laser system pumped by a copper vapor laser (1985)
    Springer
    Applied physics 38 (1985), S. 249-253 
    Details
    ISSN: 1432-0649
    Keywords: 32 ; 42.60 ; 07.65
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Laser photoionization has been used to detect trace amounts of plutonium. A high sensitivity and selectivity has been achieved by applying three-step excitation and ionization of the plutonium atoms with high pulse-repetition rates and additional mass determination by time-of-flight measurements. A laser system was developed which consists of a copper vapor laser pumping three dye lasers simultaneously. Samples containing between 1010 and 1012 atoms of239Pu on Re filaments were measured yielding strong resonance signals with maximum ion count rates of several kHz at a vanishingly low background. A detection efficiency of 10−7 was determined allowing the detection of about 108 plutonium atoms in a sample.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00818051
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Isotope shift of182Hg and an update of nuclear moments and charge radii in the isotope range181Hg-206Hg (1986)
    Springer
    The European physical journal 325 (1986), S. 247-259 
    Details
    ISSN: 1434-601X
    Keywords: 21.10.Ft ; 21.10.ky ; 35.10.Fk
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The technique of collinear fast-beam laser spectroscopy has been used to measure the isotope shifts of the even-even isotopes of Hg (Z=80) in the mass range 182≤A≤198 at the on-line mass separator ISOLDE at CERN. The atomic transition studied (6s 6p 3 P 2- 6s7s 3 S 1,λ=546.1 nm) starts from a metastable state, which is populated in a quasi resonant charge transfer process. The resulting changes in nuclear mean square charge radii show clearly that182Hg follows the trend of the heavier, even, weakly oblate isotopes. Correspondingly the huge odd-even shape staggering in the light Hg isotopes continues and the nuclear shape staggering and shape coexistence persists down to the last isotope investigated,181Hg. An update of isotope shift and hyperfine structure data for181–206Hg is given, with a revised evaluation of the differences in nuclear mean square charge radii and of spectroscopic quadrupole moments.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01294605
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    Paper (German National Licenses)
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