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  • 32.70.Fw  (5)
  • 35.10.Di  (2)
  • 07.65.Eh  (1)
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  • 1
    Electronic Resource
    Electronic Resource
    Isotope separation by nonlinear resonances in a Paul trap (1996)
    Springer
    Applied physics 62 (1996), S. 511-513 
    Details
    ISSN: 1432-0649
    Keywords: 32.80.Pj ; 07.65.Eh ; 07.75.h
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Deviations from the ideal quadrupole potential in a Paul ion trap create nonlinear resonances at certain operating points inside the stability diagram, where in the absence of potential pertubations storing times are very long. In the presence of those pertubations, however, the ions are lost from the trap. Since these resonances are mass dependent and the mass resolution is of the order of 100 it can be used to separate isotopes of a given element by choosing suitable trap operating conditions. Experiments on a natural mixture of Eu+ ions of mass 151 and 153 show that in a simple way, by proper choice of the operating point, the ions can be completely separated and laser-induced optical spectra of a single isotope can be received. This is the first time that mass separation in a Paul trap is performed by nonlinear effects in contrast to the usual way of using the mass dependent boundaries of the stability diagram
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01081052
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  • 2
    Electronic Resource
    Electronic Resource
    Experimental lifetime of the metastable 5D 3/2 state in Ba+ (1992)
    Springer
    The European physical journal 24 (1992), S. 339-342 
    Details
    ISSN: 1434-6079
    Keywords: 32.70.Fw ; 32.50.+d ; 32.80.Pj
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A discrepancy exists between theoretical and experimental lifetimes of the metastable 5D 3/2 state in Ba+. In order to redertermine that lifetime, we probe the population of the metastable 5D 3/2 state of a Ba+ ion cloud stored in a Paul ion trap in the presence of He buffer gas as the function of time delay after pulsed laser excitation of this state. The measured decay rates at different buffer gas pressures are extrapolated to zero pressure and we obtain a radiative decay time of 48.0±5.9 s. This is not in agreement with theoretical predictions of about 80 s, but reduces the discrepancy from a previously reportet experimental value of 17.5 s. If the possibility of finestructure mixing to an adjacent 5D 5/2 level by collisions is considered our value represents a lower limit of the radiative lifetime for the 5D 3/2 state.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01426681
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  • 3
    Electronic Resource
    Electronic Resource
    Lifetime of the metastable 6P 3/2 level of PbII (1989)
    Springer
    The European physical journal 11 (1989), S. 283-286 
    Details
    ISSN: 1434-6079
    Keywords: 32.50 ; 32.70.Fw
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Pb+-ions were stored in a r.f.-quadrupole trap. Short laser pulses at a 710-nm M1-transition excited the ions to the metastable 6P 3/2 level. Time-resolved registration of the subsequent decay photons at the same wavelength directly gives the lifetime of that state. No dependence of the decay rate on the density of different buffer gases up to 10−5 mbar pressure was observed and from this we deduced upper limits to the quenching cross section. We have observed, however, a small dependence on the stored ion number. The final result for the lifetime is 41.2 ± 0.7 ms in agreement with the result of a previous calculation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01438500
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  • 4
    Electronic Resource
    Electronic Resource
    Experimental ground stateg J-factor of Ba+ in a Penning ion trap (1993)
    Springer
    The European physical journal 25 (1993), S. 205-208 
    Details
    ISSN: 1434-6079
    Keywords: 32.80.Bx ; 32.60.+i ; 35.10.Di
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We observed the Zeeman-splitting of the 6S 1/2 – 6P 1/2 resonance transition of Ba+-ions (493.4 nm) in a 6T magnetic field. The ions were stored in a Penning quadrupole trap. We polarized the ground state by optical pumping and in a microwave-optical double resonance experiment we measured the ground state Zeeman-splitting. From the resonance frequency and the cyclotron frequency of electrons stored in the same trap we derived theg-factor of the 6S 1/2 state. The result isg J(6S 1/2)=2.002 490 6(11), in reasonable agreement with recent calculations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01426881
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  • 5
    Electronic Resource
    Electronic Resource
    Lifetime measurements of the 3D3/2 and 3D5/2 metastable states in CaII (1993)
    Springer
    The European physical journal 25 (1993), S. 295-298 
    Details
    ISSN: 1434-6079
    Keywords: 32.70.Fw ; 32.80.Pj
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The lifetime of the metastable 3D3/2 and 3D5/2 states of Ca+ ions is determined in a r.f. ion trap by laser excitation of this levels and subsequent time delayed probing of the state population by a second laser. In a buffer gas atmosphere of about 10−5−10−6 mbar of He we observe quenching to the ground state and strong finestructure mixing of the two D-states. This mixing allowes only the determination of the combined lifetime. Our result of τ(3D)=1.24(39) s is in good agreement with theoretical calculations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01437293
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  • 6
    Electronic Resource
    Electronic Resource
    Lifetime and collisional depopulation of the metastable 5D 3/2-state of Yb+ (1988)
    Springer
    The European physical journal 8 (1988), S. 235-237 
    Details
    ISSN: 1434-6079
    Keywords: 32.50 ; 32.70.Fw
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The lifetime and collisional depopulation rates of the metastable 5D 3/2 state of Yb+ have been determined in a radiofrequency ion trap by observation of the fluorescence count rate after ion excitation by a short laser pulse. From measurements using He, N2 and H2 as buffer gases between 10−8 and 10−6 mbar pressure and linear extrapolation to zero pressure we obtain a lifetime of τ=52.15±1.00 ms and rate constants ofR(H2)=(1.02±0.10)×10−9 cm3/s andR(N2)=(1.78±0.19)×10−10 cm3/s. The lifetime is in fair agreement with a calculated value of 74 ms.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01436946
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  • 7
    Electronic Resource
    Electronic Resource
    Ground- and excited stateg-factors of Ba+ (1991)
    Springer
    The European physical journal 18 (1991), S. 113-115 
    Details
    ISSN: 1434-6079
    Keywords: 35.10.Di ; 32.30.Dx
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We observed the Zeeman-splitting of the 6S 1/2-6P 1/2 resonance transition of Ba+ ions (493.4 nm) in a 6 T magnetic field. The ions were stored in a Penning quadrupole trap. From the splitting and the simultaneously measured cyclotron frequency of stored electrons we derived theg-factors of the 6S 1/2 and 6P 1/2 states. The results areg(6S 1/2)=2.00267(20) andg(6P 1/2)=0.66634(22).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01418176
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  • 8
    Electronic Resource
    Electronic Resource
    Improved lifetime measurements of the 3D3/2 and 3D5/2 metastable states of Ca II (1994)
    Springer
    The European physical journal 29 (1994), S. 159-161 
    Details
    ISSN: 1434-6079
    Keywords: 32.70.Fw ; 32.80.Pj
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The lifetimes of both metastable 3D-levels of Ca+ have been measured using the ion storage technique. Operation at UHV-conditions eliminated the earlier reported problems of collisional finestructure mixing between those states [1], which is inherent to measurements at buffergas background. The results of τ(D 3/2)=1113(45) ms and τ(D 5/2)=1054(61) ms improve our earlier result [1] by almost one order of magnitude and are in good agreement with recent theoretical calculations [3, 4, 5].
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01437133
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