Experimental and theoretical lifetimes and transition probabilities for spectral lines in Nb II

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Table 1.

Experimental details and the measured and calculated lifetimes of the levels in Nb II.

Level	E^(a) [cm⁻¹]	Intermediate level		Excitation λ_air	λ_obs^(b)	Method ^(c)	τ_exp [ns]	τ_theory [ns]

		Term	E^(a) [cm⁻¹]	[nm]	[nm]			This work	Kurucz ^(d)
6s ⁵F₅	68 772.9	5p ⁵G₆	36 455.5	309.3	325	2ω	2.55 ± 0.10	2.54	2.79
5d ⁵H₃	70 895.5			282.6	266	2γ, 2ω	1.65 ± 0.20	1.72	1.65
5d ⁵H₅	71 684.9	5p ⁵G₄	34 632.0	269.8	270, 293	2ω + AS	1.95 ± 0.15	1.82	1.76
5d ⁵H₆	72 231.7	5p ⁵G₅	35 474.2	272.0	272	2ω + AS	1.95 ± 0.15^e	1.86	1.77
5d ⁵H₇	72 861.3	5p ⁵G₆	36 455.5	274.6	274	2ω + AS	1.75 ± 0.10^e	1.89	1.77
5d ⁵G₅	72 460.7	5p ⁵G₅	35 474.2	270.3	286	2ω + AS	2.1 ± 0.2	2.08	2.02
5d ⁵G₆	73 161.1	5p ⁵G₆	36 455.5	272.4	285	2ω + AS	2.1 ± 0.2	2.11	2.05
5d ⁵P₁	70 956.0			282.4	299	2γ, 2ω	2.10 ± 0.15	2.11	2.11
5d ⁵P₃	72 125.2	5p ⁵G₄	34 632.0	266.6	295	2ω + AS	2.00 ± 0.15	2.03	1.98
5d ⁵F₁	71 196.1			281.5	275	2γ, 2ω	2.20 ± 0.15	1.92	1.94
5d ⁵F₃	72 183.1	5p ⁵G₄	34 632.0	266.2	280	2ω + AS	2.00 ± 0.15	1.96	1.98
5d ⁵F₄	72 624.9	5p ⁵G₅	35 474.2	269.1	285	2ω + AS	2.00 ± 0.15	1.98	1.95
5d ⁵F₅	73 115.4	5p ⁵G₆	36 455.5	272.7	285	2ω + AS	1.95 ± 0.15	2.00	1.96

Notes.

^(a)

Ryabtsev et al. (2000).

^(b)

All fluorescence measurements were performed in the second spectral order.

^(c)

2ω means the second harmonic of the dye laser, AS means one added Stokes shift (4153 cm⁻¹) and 2γ means two-photon excitation.

^(d)

Semi-empirical superposition-of-configurations calculation by Kurucz (2017).

^(e)

Corrected for scattered light from the second step laser.

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