86
3 Electronic Excitation and Decay
Fig. 3.1 Dynamics of a two-level system with radiation. Colored curves, RWA results; black
curves, numerically exact calculations. Upper panel: state 2 population P 2 (t) with ω 21 = 0.10 a.u.,
W = 0.01 a.u. and two different radiation frequencies. Middle panel: P 2 (t) with ω 21 = 0.10 a.u.,
ω = 0.105 a.u. and different radiation–molecule couplings. Lower panel: long-time average of P 2
as a function of the field frequency, with W = 0.01 and two different transition frequencies
3 Electronic Excitation and Decay
Fig. 3.1 Dynamics of a two-level system with radiation. Colored curves, RWA results; black
curves, numerically exact calculations. Upper panel: state 2 population P 2 (t) with ω 21 = 0.10 a.u.,
W = 0.01 a.u. and two different radiation frequencies. Middle panel: P 2 (t) with ω 21 = 0.10 a.u.,
ω = 0.105 a.u. and different radiation–molecule couplings. Lower panel: long-time average of P 2
as a function of the field frequency, with W = 0.01 and two different transition frequencies