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Article
Quest for experimental M1 and E1-intercombination transition probabilities in few-electron Xe ions
The experimental access to M1 transition probabilities within thens 2 np k (1 ≦k ≦ 5) ground state configurations of highly ionized atoms is outlined. A test experiment on Xe(4...
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Article
Absolute state selective cross sections for ionization-excitation of helium in fast H+ + He and C6+ + He collisions: Zp-dependence
Absolute EUV emission cross sections for simultaneous ionization and excitation of helium by H+ and C6+ projectiles have been measured for impact energies between 0.83 and 2.3 MeV/u. In this energy range the mass...
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Article
Absolute state selective cross sections for ionization-excitation and excitation of helium in e− + He, H+ + He, H 2 + + He and H 3 + + He collisions
We have measured absolute EUV emission cross sections for ionization-excitation of helium by H+, H 2 + and H 3 + ...
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Chapter and Conference Paper
Absolute state selective cross sections for ionization-excitation and excitation of helium in e- + He, H+ + He, H 2 + + He and H + 3 + He collisions
We have measured absolute EUV emission cross sections for ionization-excitation of helium by H+, H+2 and H 3 + (v: 1.4 to 8 a.u.) and e- (v: 3.5 to 8 a.u.) and the a...
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Chapter and Conference Paper
Absolute state selective cross sections for ionization-excitation of helium in fast H+ + He and C6+ + He collisions: Zp-dependence
Absolute EUV emission cross sections for simultaneous ionization and excitation of helium by H+ and C6+ projectiles have been measured for impact energies between 0.83 and 2.3 MeV/u. In this energy range the mass...
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Article
Beam-foil lifetime study of Al-like titanium, iron and nickel
The lifetimes of the resonance levels in the Al-like ions Ti X, Fe XIV and Ni XVI have been obtained from beam-foil measurements using a variety of analytical techniques. The spectral analysis and identificati...
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Article
Experimental transition probability for theE1 intercombination transition in Be-like Xe50+
The 2s2 1S0 — 2s2p3P°1 intercombination transition in Be-like Xe50+ has been observed and the intensity decay with time has been measured using a foil-excited fast ion beam. The transition wavelength value is fou...
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Article
Study of 3d – 4f and 3d – 5f quartet and doublet transitions of doubly excited three-electron ions
We present the first observation of optical transitions between doubly excited doublet states in the term systems N V, O VI and F VII. The spectra were produced by foil excitation of fast ion beams. The assign...
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Article
The Si XIn=3−n=4 transition arrays from beam-foil spectra
In a study of Si XIn=3 ton=4 transition arrays highly resolved beam-foil spectra in the spectral region 13–16 nm were compared with simulated spectra computed with a Hartree-Fock-Relativistic program package. The...
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Article
Wavelength and lifetime measurements on intercombination transitions in 12- to 14-electron ions of Zn
The VUV spectrum of foil-excited fast Zn ions has been studied in search for the intercombination transitions in Mg I-, Al I- and Si I-like ions. The line identifications are supported by decay curve measureme...
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Article
Beam-foil spectroscopy in the 3–6 nm soft-X-ray range
A grazing-incidence spectrometer for the wavelength range λ≦13 nm has been built and tested with foil-excited fast oxygen ions. The new apparatus has been used to study the variation of the 2s 3p 3 P ...
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Article
Relative initial populations of low-lying levels of hydrogenlike lithium after foil-excitation
Decay curves of the Lyman alpha and beta and Balmer alpha transitions in foil-excited Li++ ions have been recorded for incident ion energies 0.1 to 1.3 MeV/amu. The curves have been analyzed with the aim of learn...
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Article
Beam-foil lifetime study of then=3 complex in al-like Ti9+
The beam-foil spectrum obtained using a beam of Ti3+ ions of energy 10 MeV has been studied over the wavelength range from 14 nm to 80 nm. New assignments are suggested for 18 levels belonging to the levels of th...
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Article
Beam-foil study of doubly and singly excited states in BIII
Doubly excited4 L and2 L systems of BIII have been studied by beam-foil spectroscopy. Spectra of boron (λ: 28.7–50.1 nm) have been recorded at Bochum with a resolution superior to that obtained previously. Eight ...
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Article
Tentative identification of the 5s-5p transitions in Pm I-like Au XIX
The EUV spectrum of foil-excited Au ions has been studied in the wavelength range 12–36 nm. The inherent time-resolution of the fast-beam light source has been used to discriminate against a multitude of very ...
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Article
Identification of Δn≠0 quintet transitions in four-electronF 5+
Two Δn≠0 quintet transitions, 1s 2s 2p 2 5 P—1s 2s 2p 3d 5 P 0,5 D 0, have been identified in the beam-foil spectra of fluorine. The wavelengths are compared to theoretical predictions and to those of singly-exci...
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Article
Identification of the 3s 2 3p 2 3 P 1,2 — 3s3p 3 5 S 2 0 intercombination transition in siliconlike Ni14+
The3P1, 2− 5S 2 o intercombination lines in Ni14+ have been identified in the EUV spectrum emitted by foil-excited Ni ion beams. The wavelengths are close to t...
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Article
Wavelength measurements in the quartet term system of doubly excited OVI and FVII
In the emission spectra of beam-foil excited oxygen and fluorine, it has been possible to assign lines to the quartet term systems of doubly excited three electron ions. A comparison with known spectra of sing...
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Article
Observation of transitions between quartet levels of doubly excited Al10+
The line multiplet Al XI 1s2s2p 4Po-1s2p2 4P has been observed using beam-foil spectroscopy. The mean transition wavelength λ=(53.283±0.01) nm and three out of four finestructure intervals have been determined. T...
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Article
High resolution in EUV spectroscopy of foil-excited fast ion beams
In high-resolution spectra of fast ion beams, employing a grating of high groove density in a 2m grazing-incidence monochromator, asymmetric line broadening has been observed. The effect is explained in terms ...
