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Lifetime of the 4D 3/2 and 4D 5/2 metastable states in Sr II (1987)

Gerz, Ch. ; Hilberath, Th. ; Werth, G.

Springer

The European physical journal 5 (1987), S. 97-99

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ISSN: 1434-6079

Schlagwort(e): 32.20 ; 32.50 ; 34.90

Quelle: Springer Online Journal Archives 1860-2000

Thema: Physik

Notizen: Abstract Sr+ ions were confined in a r.f. quadrupole trap for times of the order of 30 min. The metastable 4D states were populated via laser excitation of the 5P states. The weak quadrupole transition rate into the 5S 1/2 ground state at 674 and 687 nm was deduced from observation of the exponential decay. At background pressures above 10−7 mbar the radiative decay is dominated by collisional quenching. Extrapolation of the observed decay rate to zero background pressure yields the radiative lifetimes. At pressures around 10−6 mbar fine structure mixing collisions between the 4D states have been observed, which lead to corrections of the extrapolated lifetimes. As the final result we obtain 395±38 ms for 4D 3/2 and 345±33 ms for 4D 5/2. These results are somewhat higher than theoretical predictions.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF01436883

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Digitale Medien

Lifetime and collisional depopulation of the metastable 5D 3/2-state of Yb+ (1988)

Gerz, Ch. ; Roths, J. ; Vedel, F. ; [weitere]

Springer

The European physical journal 8 (1988), S. 235-237

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ISSN: 1434-6079

Schlagwort(e): 32.50 ; 32.70.Fw

Quelle: Springer Online Journal Archives 1860-2000

Thema: Physik

Notizen: 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.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF01436946

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Lifetime of the metastable 6P 3/2 level of PbII (1989)

Roth, A. ; Gerz, Ch. ; Wilsdorf, D. ; [weitere]

Springer

The European physical journal 11 (1989), S. 283-286

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ISSN: 1434-6079

Schlagwort(e): 32.50 ; 32.70.Fw

Quelle: Springer Online Journal Archives 1860-2000

Thema: Physik

Notizen: 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.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF01438500

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