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 1

Wavelengths, line intensities, and energy level classifications have been taken from Russell [3]. IS Δ𝜎^156,160 (cm⁻¹) in the 49 spectral lines (cm⁻¹) of Gd I covering the region of 3646–4936 Å on FTS, source: liquid nitrogen cooled HCL, detector: PMT. Units of measurements were wavelengths (nm), intensities in arbitrary units (A. u.), energy levels (cm⁻¹), and IS (cm⁻¹). The accuracy for lines showing IS greater than 0.060 cm⁻¹ was ±3.10⁻³ cm⁻¹, and for lines with smaller IS than 0.060 cm⁻¹ it was ±5.10⁻³ cm⁻¹.

𝜆 (nm)	Intensity (A. u.)	Energy levels (cm^−1)		IS Δ𝜎^156,160 (cm^−1)
		Odd	Even	Present data	Literature data
364.6480	30	999	28415	−0.080
364.720	5	7426	34837	−0.100
364.848	150^d	1719	29119	−0.111
367.405	400	0	27425	−0.070
368.501^a	30	0	27129	−0.121
369.693^b	50	0	27041	−0.120
370.093	50	1719	28731	−0.136
372.670	8	215	27040	−0.110	−0.108 [6]
373.2324	150	1719	28504	−0.100
374.136	30	7426	34147	−0.100
377.683	100	7234	33704	−0.111
379.637	2500	532	26866	−0.114
383.8900	30	999	27040	−0.123
390.2709	400	999	26615	−0.131
395.925	3	6976	32226	~0
405.8219	2500	215	24849	−0.110	−0.104 [7]
407.8700	3000	532	25043	−0.122	−0.122 [7]
409.1968	4	6378	30809	−0.088
411.125	3	532	24849	−0.111
411.125	3	6378	30694	−0.040
415.7784	205^d	999	25043	−0.125	−0.122 [8]
418.2767^c	60	7426	31327	−0.130	−0.144 [8]
419.0776	1500	999	24854	−0.141	−0.131 [8]
419.1626	800	999	24849	−0.100	−0.107 [8]
422.5028	200	1719	25380	−0.130	−0.160 [8]
422.5259	20	12486	36147	−0.070
422.5850	3000	1719	25376	−0.116	−0.115 [5], −0.116 [8], −0.116 [23], −0.116 [28]
426.0116	800	532	23999	−0.111	−0.111 [8], −0.111 [28]
426.6595	800	999	24430	−0.121	−0.115 [8], −0.116 [28]
426.7002	600	215	23644	−0.121	−0.114 [8], −0.113 [28]
427.4167	300	0	23389	−0.111	−0.112 [8], −0.115 [28]
428.6122	300	1719	25043	−0.125	−0.121 [8], −0.124 [28]
430.6340	1500	0	23215	−0.121	−0.114 [5], −0.114 [8]
431.3845	2000	215	23389	−0.110	−0.115 [5], −0.112 [8]
431.663	4	7234	30394	−0.077
432.1198	150	1719	24854	−0.141	−0.130 [5], −0.132 [8]
432.5693	600	532	23644	−0.111	−0.112 [5], −0.113 [8]
432.7125	1500	0	23103	−0.111	−0.114 [5], −0.117 [8]
434.6458	1500	999	23999	−0.111	−0.115 [5], −0.110 [8]
434.6624	600	215	23215	−0.111	−0.115 [8]
437.0180	40	6550	29426	~0	0 [8]
437.3833	800	532	23389	−0.111	−0.116 [4], −0.113 [5], −0.116 [8]
440.1857	800	1719	24430	−0.111	−0.119 [4], −0.115 [5], −0.116 [8]
441.4732	400	999	23644	−0.111	−0.116 [5], −0.114 [8]
448.6900	200	1719	23999	−0.111	−0.113 [8]
454.274	12	8498	30505	−0.077	−0.067 [5]
462.2187	4	7103	28414	−0.057
491.945	8	7103	27425	~0
493.633	200	10883	31135	−0.045

^a,bWe have classified these two transitions on the basis of presently obtained IS Δ𝜎^156,160 data; earlier these two transitions were wrongly classified by Russell [3]. ^cEnergy level classification of this line has been taken from Russell [3].^dDiffuse Intensity.