Abstract
We report the first detailed investigation on isotope shift, Δσ166, 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 166Er: 170Er 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, ΔT166, 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.
Highlights
The comprehensive list of the energy levels of the singly ionized erbium atom (Er II)was published by Martin et al [1] taking aid from the unpublished extension of the Er II spectral analysis carried out by van Kleef TAM et al.[2]
Isotope shift (IS) in the chosen 7spectral lines at 357.075 nm, 363.354 nm,369.265 nm, 371.239 nm, 372.952 nm, 390.631 nm, and at 590.208 nm of Er II recorded on Fourier Transform Spectrometer (FTS) were exhibited in Figs. 1-7 respectively
The IS value -2910 MHz presently measured in the line was not agreeing with the classification listed by Meggers et al [9] we support the rejection of the said classification
Summary
The comprehensive list of the energy levels of the singly ionized erbium atom (Er II)was published by Martin et al [1] taking aid from the unpublished extension of the Er II spectral analysis carried out by van Kleef TAM et al.[2]. Wyart et al [6] have classified and extended both theoretically and experimentally the Er II spectra to interpret the known energy levels first parametrically using Cowan code and the predictions of the unknown energy levels employed for the classification of the experimental hollow cathode FT spectra Their detailed investigation of level configurations has shown that the levels of 4f126p were strongly mixed with 4f115d6s and 4f115d2 configurations and provided the configuration mixing in percentages for most of the known even and odd levels. Balkrishna Keraba Ankush and Mukul Narayan Deo: Experimental Verification of Theoretical Configuration Mixing in the Energy Levels of Er II Spectra via Isotope Shift Measurements Using a FTS lines in NBS Tables [9]; and the remaining 61 lines belong to Er I spectrum as have claimed by [10].
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