Radiative data for highly excited 3d84d levels in Ni II from laboratory measurements and atomic calculations

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Table 1

Levels measured in the 3d⁸(³F)4d configuration of Ni II and the corresponding excitation schemes.

	First step excitation^a			Second step excitation			Detection
Final level	Start level	Intermediate	λ_air	Final level	λ_air	Scheme^c	Lower level	λ_air
	E^b (cm^-1)	E^b (cm^-1)	(nm)	E^b (cm^-1)	(nm)		E^b (cm^-1)	(nm)

⁴D_7/2	8393.9	54 557.0	216.6	98 467.25	227.7	3ω + S	51 557.8	213^d
⁴H_13/2	8393.9	53 496.5	221.6	98 822.55	220.6	3ω	53 496.5	221^e
⁴G_11/2	8393.9	53 496.5	221.6	99 132.78	219.0	3ω	54 557.0	224^d
⁴F_9/2	8393.9	53 496.5	221.6	99 154.81	218.9	3ω	51 557.8	210, 224^d
		54 557.0	216.6		224.1	3ω + S	54 557.0	210
⁴D_5/2	9330.0	55 417.8	216.9	99 559.33	226.5	3ω	52 738.4	214^d
⁴H_11/2	9330.0	55 299.6	217.5	100 309.29	222.1	3ω	55 299.6	222^d
⁴G_9/2	8393.9	54 557.0	216.6	100 619.26	217.0	3ω	56 371.4	226

Notes.

^(a)

For all measured levels, the first excitation step used the frequency tripled (3ω) output from the dye laser;

^(b)

Shenstone (1970);

^(c)

S imply one added Stokes component of 4153 cm^-1;

^(d)

corrected for fluorescence background from the intermediate level;

^(e)

corrected for scattered light from both lasers, see also Fig. 2.

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