**Table 3:** Experimental radiative lifetimes of Hf I.
Configuration^a	Energy	J	$\lambda_{\rm exc}^b$	$\lambda_{\rm obs}^c$	Exp. lifetime (ns)
	cm^-1		(Å)	(Å)	This work	DSL^d
5d²6s(a⁴P)6p y⁵D^o	31 342.51	3	3190.55	3730	63.5(4.5)	62.3(3.1)
5d²6s(b²D)6p z¹D^o	31 610.80	2	3163.48	3850	19.3(1.7)	18.7(0.9)
5d²6s(a⁴P)6p z⁵P^o	33 121.48	2	3250.47	3020	15.3(1.5)
	33 538.15	2	3207.03	2980	11.2(1.1)
	34 877.04	3	2867.22	2870	5.7(0.7)
	46 170.12	2	2165.90	3180	12.2(1.2)
	46 775.98	3	2137.85	2760	13.0(1.2)
	47 590.09	3	2101.28	3240	6.7(0.5)

^a Notation from Moore (1952).
^b Laser wavelength used to populate the upper state.
^c Wavelength used to detect the fluorescence signal.
^d DSL = Duquette et al. (1982).

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