Theoretical interpretation and new energy levels in Er II

摘要: In this work, we extend the classification of spectrum singly ionized erbium (Er II) both theoretically and experimentally. First, known energy levels are interpreted parametrically using Cowan code on two sets configurations with interaction. Then predictions for unknown used to hollow cathode FT spectra recorded at US National Solar Observatory Kitt Peak. All 130 even parity described a root mean square deviation 61 cm−1 summed contributions 4f126s, 4f125d, 4f116s6p 4f115d6p in their eigenvectors presented. A similar agreement is obtained 230 odd parity. The detailed configuration percentages show that 4f126p strongly mixed 4f116s5d 4f115d2. transition probabilities by means good qualitative observed intensities classified lines they reported chains transitions 32 new revised J-values six additional levels. level values uncertainties derived least squares from complete array Er II natural isotopic blending, whereas earlier compiled had been 168Er isotope.