Experimental MoIIoscillator strengths

Abstract

Experimental branching fractions (BFs) of Mo II, ranging in wavelength from 1970 to 4370 Å, have been measured from intensity calibrated spectra recorded with the Lund UV Fourier transform spectrometer (FTS). Radiative lifetimes for 10 levels have been measured using the method of laser-induced fluorescence (LIF). Combining BFs with new as well as previously measured lifetimes, 16 in total, oscillator strengths of 91 lines were derived. Seven transitions are resonance lines involving the ground state. The BF results are compared with calculations made with the Cowan code and the f-values are compared with previously published data. Improved wavelengths from an ongoing term analysis are also reported.

Experimental and theoretical radiative properties of odd-parity highly excited levels in Mo II

“…The results fall in the range from 2.2 to 7.5 ns. One can see that the lifetime of the 48 022.82 cm −1 level reported by Hannaford and Lowe [7] and Sikström et al [8] with the LIF method agrees well with our result. But for [13].…”

“…The lifetimes of the levels at 48 022.82 and 60 992.76 cm −1 , which were investigated previously by Hannaford and Lowe [7], Sikström et al [8] and by Lundberg et al [10], respectively, were also measured in the present paper for comparison. Corresponding theoretical lifetime values were also calculated using the multiconfigurational HFR method taking core-polarization effects into account, and they are in good agreement with the experimental results having in mind the complexity of the calculations in such heavy atomic systems.…”

“…Concretely, in 1983 Hannaford and Lowe [7] measured lifetimes for 15 levels of the z 6 F • , z 4 P • , z 6 P • and z 6 D • terms using the LIF method applied to a sputtered metal vapour. Later on, Sikström et al [8] reported experimental radiative lifetimes for ten levels by the LIF technique. With a HFR approximation including core polarization effects, theoretical lifetimes for 37 levels of Mo II and the oscillator a e-mail: e.biemont@ulg.ac.be b e-mail: dai@jlu.edu.cn strengths of the depopulating transitions were calculated by Quinet [9].…”

Experimental oscillator strengths and hyperfine constants in Nb ii

“…Within this project the term analyses of Y ii (Nilsson et al 1991), Mo ii (Nilsson & Pickering 2003), Ru ii (Karlsson et al 2002), Pd ii (Litzén et al 2001) and Ag ii (Kalus et al 2002) have been published, and analyses of Zr ii and Rh ii are in progress. Oscillator strengths have been measured in Zr ii (Sikström et al 1999;Ljung et al 2006), Mo ii (Sikström et al 2001), Ru ii (Johansson et al 1994) and Pd ii (Lundberg et al 1996).…”

Atomic structure, radiative lifetime and oscillator strength calculations in doubly ionized molybdenum (Mo iii)

“…Later on, Sikström et al (2001) reported experimental radiative lifetimes for 10 levels by the same method. With the HFR approach including core-polarization effects, theoretical lifetimes for 37 levels of Mo II and the oscillator strengths of the depopulating transitions were calculated by Quinet (2002).…”