Lifetime Measurements for some Δ n = 0 Transitions in Cl XIII-Cl XV

Section: References: _peg Et Al (91 Trabert Et Al [S 81 (Scaled Value...mentioning

confidence: 96%

EUV Spectrum and Lifetimes of Foil-Excited Phosphorus

Heckmann

1980

“…To our knowledge, no measurements are available for lifetimes in Li-like ions with 12 ≤ Z ≤ 20. However, Ishii et al [23] have measured lifetimes from beam foil experiments for the 2p 2 P o 1/2,3/2 levels of Cl XV, namely 1.0±0.1 and 0.71±0.03 ns, respectively. Both these measured values agree very well with our calculated lifetimes.…”

Section: Lifetimesmentioning

confidence: 99%

Energy levels, radiative rates and electron impact excitation rates for transitions in Be-like Ti XIX

Aggarwal¹,

Keenan²

2012

We report calculations of energy levels, radiative rates, and electron impact excitation rates for transitions in Li-like ions with 12 ≤ Z ≤ 20. The GRASP (general-purpose relativistic atomic structure package) is adopted for calculating energy levels and radiative rates, while for determining the collision strengths and subsequently the excitation rates, the Dirac atomic R-matrix code (DARC) is used. Oscillator strengths, radiative rates, and line strengths are reported for all E1, E2, M1, and M2 transitions among the lowest 24 levels of the Li-like ions considered. Collision strengths have been averaged over a Maxwellian velocity distribution, and the effective collision strengths obtained are reported over a wide temperature range up to 10 7.4 K. Additionally, lifetimes are also listed for all calculated levels of the above ions. Finally, extensive comparisons are made with available results in the literature, as well as with our parallel calculations for all parameters with the Flexible Atomic Code (FAC) in order to assess the accuracy of the reported results.

“…The full and broken lines, respectively, represent calculations in a semiempirical Coulomb approximation with Hartree-Slater core [48]. References: Li [34,47], Be [64,65], B [65], C [66], N [67][68][69], O [70,71,73], F [67], Ne [72], Mg [17], Al [74], Si [75], S [76], Cl [77,78], Fe [59], Ni [79], Kr [19,21,49], U [23].…”

Section: Li-like Ionsmentioning

confidence: 99%

Isoelectronic trends of line strength data in the Li and Be isoelectronic sequences

Curtis

2006

The decays of the 2p J=1/2 and J=3/2 levels of Li-like ions and of the 2s2p 1,3Po1 levels of Be-like ions can be used as simple-atom test beds for lifetime measurements and for the development of accurate calculations of the transition rates. We have summarized and filtered the experimental data in order to obtain consistent data sets and isoelectronic trends that can be compared to theoretical predictions. The graphical presentation of line strength data enables direct comparison and evaluation of the merit of data along extended isoelectronic sequences. From this, the precision that is necessary in future meaningful experiments can be deduced.