Figure 4
From: On the remarkable nonlinear optical properties of natural tomato lycopene
(a) Fluorescence emission of lycopene, (b) Zoom on the major Emission peaks and their convolution, (c) Schematic energy level diagram for carotenoids. Here 1Ag, is the ground state and 1Bu, the allowed excited state. 2Ag, is a forbidden excited electronic state populated by non-radiative relaxation from the 1Bu state.
