Experimental Studies on Electronic Configuration Mixing for the Even-Parity Levels of Gd I Using Isotope Shifts Recorded in the Visible Region with FTS

Table 2

IS Δ𝜎^156,160 data in the 42 spectral lines of Gd I covering the region of 4087–7749 Å; the listed literature data mostly studied by means of laser spectroscopy have been employed to evaluate the LIS, Δ𝑇^156,160 of the presently involved levels. Units of measurements were wavelengths (nm), intensities (A. u.), energy levels (cm⁻¹), and IS (cm⁻¹).

𝜆 (nm)	Intensity (A.u.)	Level (cm^−1)		IS Δ𝜎^156,160 (cm^−1) Reference
		Odd	Even
408.7325	10^†	0	24458	−0.061 [7]
408.783	6	532	24988	−0.083 [7]
429.305	5^‡	41370	18083	0 [8]
436.159	2^‡	40894	17973	+0.010 [8]
451.556	1^‡	39458	17318	0 [8]
493.412	400?	11830	32091	−67.8^#
561.791	4000	0	17795	−0.071 [5]
562.955	800	215	17973	−0.071 [5], −0.074 [14], −0.076 [29]
563.225	2500	0	17749	−0.056 [5] −0.056 [14], −0.056 [29]
563.349	200	7103	24849	−0.024 [22]
564.324	6000	215	17930	−67.8^#
567.453	8	0	17617	−0.073 [14], −0.073 [29]
568.666	100	215	17795	−0.071 [13], −0.071 [14], −0.071 [15], −0.075 [29]
569.213	200	7480	25043	−0.037 [22],
569.622	8000	532	18083	−0.068 [5], −0.070 [15], −0.064 [29]
570.135	2500	215	17749	−0.056 [5], −0.056 [14], −0.056 [15], −0.056 [24], −0.057 [29]
570.942	500	999	18509	−0.073 [5], −0.075 [15], −0.076 [29]
573.216	100	532	17973	−0.074 [14], −0.075 [15], −0.073 [29]
573.598	150	7947	25376	−0.029 [22]
574.466	400	215	17617	−0.073 [5], −0.073 [14], −0.073 [15], −0.073 [24], −0.072 [29]
574.683	1000	532	17930	−67.8^#
575.188	300	0	17380	−0.072 [5], −0.073 [13], −0.073 [14], −0.073 [15], −0.073 [24], −0.073 [29]
575.417	250	7480	24854	−0.045 [22],
579.138	4000	532	17795	−0.069 [5], −0.072 [13], −0.072 [14], −0.072 [15], −0.070 [19], −0.072 [24], −0.072 [29]
580.772	40?	6786	23999	−0.025 [22]
582.397	200	215	17380	−0.074 [13], −0.074 [15], −0.073 [29]
585.163	5000	999	18083	−0.070 [5], −0.071 [15], −0.070 [19], −0.070 [29]
585.274	—	532	17617	−0.076 [29]
585.622	4000	999	18070	−0.074 [5], −0.073 [13], −0.073 [14], −0.073 [15], −0.071 [19], −0.073 [29]
586.958	—	7426	24458	−0.068^$ [26]
587.265	2	6976	23999	−0.108 [22]
588.958	?	999	17973	−0.076 [15], −0.076 [29]
590.456	800	999	17930	−70.3^#
591.673	—	7562	24458	−0.068 [22]
591.677	50	7103	23999	−0.030 [22]
592.328	?	8498	25376	−0.015 [22]
593.029	200	6786	23644	−0.028 [22]
593.684	200	6550	23389	−0.029 [22]
593.771	150	6378	23215	−0.030 [22]
597.725	150	6378	23103	−0.031 [22]
599.799	6	6976	23644	−0.111 [22]
599.908	100	6550	23215	−0.030 [22]
610.907	80	1719	18083	−0.072 [14]
611.407	2000	1719	18070	−0.074 [13], −0.074 [14]
773.35		999	13926	+0.018 [16]
774.93		532	13433	+0.016 [16]

^†This intensity value has been taken from [7]. ^‡These intensity values have been taken from [8]. ^$Derived IS, Δ𝜎^156,160 value from the profile of GD I spectrum reported in [26]. ^#Our unpublished FTS data.