Table 3. Decay times of uracil as measured by pump–probe experiments in gas phase or solution (denoted by ^a ) or calculated theoretically using different methods, as indicated. The symbol X indicates that the relevant paper discusses that timescale without giving a quantitative time constant. Numbers in parentheses in the third block refer to Ensemble III (see text).

Setup		τ 1 [fs]	τ 2 [fs]	τ 3 [ps]	Ref.
Experiment
λ pump [nm]	λ probe [nm]
267	n × 800	—	—	2.4	Kang et al. 16
250	200	<50	530	2.4	Ullrich et al. 15
267	2 × 400	130	—	1.1	Canuel et al. 14
267	330 a	96	—	—	Gustavsson et al. 17
267	330 a	<100	—	—	Gustavsson et al. 18
262	n × 780	70	—	2.2	Kotur et al. 12 (parent ion)
262	n × 780	90	—	3.2	Kotur et al. 12 (69+ fragment)
262	n × 780	70	—	2.4	Matsika et al. 13 (parent ion)
262	n × 780	90	—	2.6	Matsika et al. 13 (69+ fragment)
Theoretical method
FMS:CASSCF(8,6)		X	—	—	Hudock et al. 99
SH:CPMD/BLYP		—	551–608	—	Nieber et al. 100
					Doltsinis et al. 101
SH:OM2/MRCI		21	570	—	Lan et al. 102
SH:CAS(10,8)		—	650–740	>1.5–1.8	Barbatti et al. 24
					Nachtigallova et al. 103
SH:CAS(14,10)		X	X		Fingerhut et al. 104
SH:CAS(14,10)		—	516		Fingerhut et al. 105
This work
S0 + T1		—	—	2.4 ± 0.1 (4.2 ± 0.1)	Ensemble II (III)
S0 + T1		63 ± 7 (48 ± 11)	—	2.8 ± 0.1 (5.2 ± 0.1)	Ensemble II (III)
ππ*		30 ± 1 (8 ± 1)	—	3.2 ± 0.1 (2.6 ± 0.1)	Ensemble II (III)

^a Fluorescence upconversion in aqueous solution.