96
3 Electronic Excitation and Decay
energy
•
emiss
intensity
emission
abs
intensity
absorption
Q r
U 0
U 1
Fig. 3.3 Potential energy curves and electronic spectra. The ground and excited PES and their
equilibrium geometries are similar. The red dot indicates the Franck–Condon point
energy
•
emiss
intensity
emission
abs
intensity
absorption
Q r
U 0
U 1
Fig. 3.4 Potential energy curves and electronic spectra. The ground and excited PES are similar
but the respective minima are displaced along the coordinate Q r . The red dot indicates the Franck–
Condon point