Beam-foil lifetime study of Al-like titanium, iron and nickel

Abstract

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 identification of cascade transitions necessary for application of the ANDC procedure have been aided by recent observations of laser-produced plasmas. The lifetime values obtained from ANDC analyses for the 3 s 3 p2 doublet levels agree well with predictions based on semi-empirical Hartree-Fock calculations. However, the ANDC results for the 3 s 2 3 d levels fall between the values obtained using multi-exponential curve-fitting and from the calculations.

Large scale CIV3 calculations of fine-structure energy levels, oscillator strengths, and lifetimes in Fe XIV and Ni XVI

“…These are compared with the beam-foil measurements of Pinnington et al [16] and the calculations of Aggarwal et al [28], Fawcett [20], and Bhatia and Doschek [13]. The agreement between theory and experiment is within 10% for the lowest 5 levels belonging to the 3s3p 2 configuration.…”

“…Träbert et al [7,17] reported lifetimes for high spin 3s3p 2 ( 4 P) and 3s3p3d ( 4 F 0 ) levels in Fe XIV and Ni XVI. Pinnington et al [16] also measured the lifetimes for a few low-lying levels in Ni XVI. Most of the results available in the literature so far are confined to only transitions within the 3s 2 3p, 3s3p 2 , 3s 2 3d, 3p 3 , and 3s3p3d configurations.…”

“…Previously, fine-structure excitation energies, absorption oscillator strengths, and radiative decay rates for resonance transitions in Fe XIV and Ni XVI were studied both experimentally and theoretically [2,[4][5][6][7][13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28]. Träbert et al [7,17] reported lifetimes for high spin 3s3p 2 ( 4 P) and 3s3p3d ( 4 F 0 ) levels in Fe XIV and Ni XVI.…”

ATOMIC DATA AND SPECTRAL LINE INTENSITIES FOR Ni XVI

“…There has been extensive laboratory work on Ni XVI and other lines of the Al-like isoelectronic sequence from laser-produced plasma experiments (see, for example, Churilov and Levashov [15], Redfors and Litzén [16]), beam-foil spectroscopy (see, for example, Träbert et al [17], Buchet-Poulizac and Buchet [20], Pinnington et al [21]), spark spectra (Jupén and Curtis [22]), and tokamak spectra (Jupén and Curtis [22], Hinnov et al [19]). Specifically, in Table I the experimental energies were obtained as follows: level 2, from Hinnov et al [19]; levels 7-12, from Shirai et al [14]; levels 4 -6, 13-15, 21-24, and 26 -40, from Churilov and Levashov [15]; level 3, from Redfors and Litzén [16]; levels 16 -18, from Träbert et al [17]; and level 19, from Levashov et al [18].…”

New atomic data for Ti X

“…Experiments determining the fine-structure splitting of 3s3p 2 4 P in Al-like ions and for extended analysis of Al-like K VII-Ni XVI spectra up to the 3p 2 3d and 3s3d 2 configurations were performed by Redfors [14] and Churilov [4], respectively. Calculations of transition probabilities for electric dipole transitions between n = 3 doublet levels of Al-like Ti have been tested by lifetime measurements at Bochum [15]. Spectral data and Grotrian diagrams were presented by Kazuo [16] for highly ionized titanium, Ti V-Ti XXII.…”