Isotope shift (IS) measurements in 67 spectral lines were carried out for the neutral gadolinium atom in the wavelength region of 4950–5350 Å using a BOMEM DA8 Fourier transform spectrometer with a liquid-nitrogen-cooled hollow cathode lamp as a source and a photomultiplier tube as the detector. The present investigation provided experimental IS data in 44 lines for the first time. Out of 53 high even levels encountered in the studies, level ISs have become available for 13 for the first time. The study also contributed to confirmations of previously assigned 4f75d6s6p, 4f75d26p and 4f85d6s configurations for some of the even-parity energy levels. Strong configuration interaction has been observed in the few high even-parity levels pertaining to 4f75d6s6p and 4f75d26p configurations.
Abstract:We report the first detailed investigation on isotope shift, ∆σ 166, 170 measurements carried out in the spectrum of singly-ionized erbium (Er II/ Er + ) recorded with a FTS. Isotope shift in 85 spectral lines were determined in the 350-590 nm wavelength region. The source was accomplished of mixture of highly enriched isotopes of 166 Er: 170 Er in 7:10 ratio respectively and the detector was a photomultiplier tube. These investigations have contributed significantly to the understanding of the 92 known energy levels of Er + . Level isotope shift, ∆T 166, 170 values have been evaluated for 29 even-and 63 odd-parity energy levels for the first time. On the basis of the derived level isotope shifts the configuration mixing was estimated for altogether 92 involved levels and compared those with the theoretically predicted configuration mixings available in the literature and found that both the theoretical and experimental mixings have excellent agreement with each other.
Electronic configuration (4f 7 6s 2 6p + 4f 7 5d6s6p + 4f 7 5d 2 6p) mixing studies in the high even-parity energy levels of Gd I spectrum have been carried out on the basis of isotope shift (IS) Δ 156,160 data recorded in 49 spectral lines partially in the visible wavelength region on Fourier Transform Spectrometer (FTS) and the relevant spectral line IS data available in the literature. We employed "Sharing rule" to the experimentally observed level isotope shifts (LIS) of the even-parity levels for finding the percentage composition of each configuration being mixed. An FTS spectrum of Gd I in the region of 365-495 nm acquired employing the highly enriched Gd isotopes in liquid nitrogen cooled hollow cathode lamp (HCL) as a light source and photomultiplier tube as the detector. The studies of altogether 48 even-levels have revealed that amongst the 20 high even parity levels assigned previously to >95% 4f 7 5d6s6p configuration, 10 levels have agreed very well whereas 7 have exhibited large contribution of 4f 7 5d6s6p configuration compared to 4f 7 5d 2 6p configuration and 3 levels have equal contribution of 4f 7 5d6s6p and 4f 7 5d 2 6p configurations. Out of 8 unassigned levels, 6 have dominant 4f 7 5d6s6p configuration compared to 4f 7 5d 2 6p configuration and the remaining two have dominancy in 4f 7 5d 2 6p configuration.
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