TABLE 2.

Kinetic Model Analysis of β-Carotene Anti-Stokes Intensities^a

figure	component	τ21 (fixed) (ps)b	τ10 (fixed) (ps)c	τ00 (fit) (ps)	d (fit)d
6a	S0 C–C (1523 cm−1)	0.2	12.6	0.7 (0.4)	171 (85)
6b	S0 C–C (1157 cm−1)	0.2	12.6	5.4 (0.9)	25 (3)
6c	S0 C–CH3 (1004 cm−1)	0.2	12.6	12.1 (2.5)	12 (2)

^aParameters were determined using eq 8 to model the data in Figure 6.

^bThe time constant for S₂ ← S₁ internal conversion, τ₂₁, was much faster than the time resolution of this experiment and could not, therefore, be experimentally determined. The value of 0.2 ps was chosen as described in the text.

^cThe S₁ ← S₀ time constant was calculated as the weighted mean of the decay times, τ₀, determined from the exponential fits to the Stokes kinetics (see Table 1).

^dThe enhancement factor, d, is an empirical measure of the increase in population in v = 1 of the hot S₀ state relative to the room-temperature S₀ state (see text).