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Relaxation Type:











                                                                                     -9
                                                                                               -5
                 1. Resonant emission S1 to S0 fast 10 -10 s (fluorescence)

                  common in atoms



                  strong absorber, shorter lifetime



                                                                                             -9
                                                                                                       -5
                 2. Non-resonant emission S1 to S0 fast 10 -10 s (fluorescence)

                  common in molecules



                  v. fast vibrational relaxation


                  red shifted emission (Stokes shift)
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