Beam-foil lifetimes of O VII in the 10?100 ps-range

Heckmann, P. H.; Buttlar, H. v.

doi:10.1007/bf01438103

Cited by 7 publications

(3 citation statements)

References 20 publications

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“…The foil is moved relatively to the optical axis of a 2.2m grazing-incidence spectrometer [19,20] by a step motor (step width 0.05 to 0.25 ram) via a precision screw. The foil is moved relatively to the optical axis of a 2.2m grazing-incidence spectrometer [19,20] by a step motor (step width 0.05 to 0.25 ram) via a precision screw.…”

Section: Methodsmentioning

confidence: 99%

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Beam-foil lifetimes of highly ionized silicon

1977

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Electronically excited states of Si ions are created by passing a 20MeV Si s+ beam through a thin carbon foil. The EUV-radiation (2= 13-61 nm) emitted by the beam is analyzed using a grazing-incidence spectrometer. From the decay curves, lifetimes of 24 low lying levels in Si VIII to Si XII and of the 4f and 5 g levels of Si XI and Si XII are derived. Cascades from doubly excited states turn out to be an important contribution to the radiation observed. The lifetime values of this work are compared to theoretical data mainly of Wiese, Sinano~lu and Dankwort/Trefftz. Most experimental values agree with at least one of the theoretical values. The decay time 560 ps of the 2s2p 3 3D~ state of Si IX is clearly longer than the theoretical prediction (highest value 455 ps by Sinano~lu).

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Section: Methodsmentioning

confidence: 99%

“…2, 3, [5][6][7][8][9][10][11][12][13][14][15][16] only. On the other hand, unresolved slow cascades will also give rise to wrong lifetime data [19]. Experimenters [-17, 18] claimed that they were able to fit most of the decay curves with one exponential, i.e.…”

Section: Introductionmentioning

confidence: 99%

Beam-foil lifetimes of highly ionized silicon

1977

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“…E1, E2, M1, and M2. Also included in this table are the theoretical results of Savukov et al (2003) from mbpt and some early measurements by Träbert et al (1977) from beam-foil spectra. In general, agreement between our present and earlier (Savukov et al 2003) theoretical lifetimes is better than 20% for most of the levels, but the differences are larger for a few levels, such as 6, 36, and 49.…”

Section: Lifetimesmentioning

confidence: 99%

Energy levels, radiative rates, and electron impact excitation rates for transitions in O VII

Aggarwal¹,

Keenan²

2008

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Aims. In this paper we report calculations for energy levels, radiative rates, and electron impact excitation rates for transitions in O vii. Methods. The grasp (general-purpose relativistic atomic structure package) is adopted for calculating energy levels and radiative rates. For determining the collision strengths and subsequently the excitation rates, the Dirac atomic R-matrix code (darc) and the flexible atomic code (fac) are used. Results. Oscillator strengths, radiative rates, and line strengths are reported for all E1, E2, M1, and M2 transitions among the lowest 49 levels of O vii. Collision strengths have been averaged over a Maxwellian velocity distribution, and the resulting effective collision strengths are reported over a wide temperature range below 2 × 10 6 K. Additionally, lifetimes are also listed for all levels.

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Beam-foil spectroscopy in the 3–6 nm soft-X-ray range

Möller

Heckmann

1988

Z Phys D - Atoms, Molecules and Clusters

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Beam-foil lifetimes of O VII in the 10?100 ps-range

Cited by 7 publications

References 20 publications

Beam-foil lifetimes of highly ionized silicon

Beam-foil lifetimes of highly ionized silicon

Energy levels, radiative rates, and electron impact excitation rates for transitions in O VII

Beam-foil spectroscopy in the 3–6 nm soft-X-ray range

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