what happens when a molecule absorbs light?
Post on 30-Dec-2015
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WHAT HAPPENS WHEN A MOLECULE ABSORBS LIGHT?
4 different fates of absorbed light are presented in the next slides
1) INTERNAL CONVERSION
2) INTERSYSTEM CROSSING
3) FLUORESCENCE
4) PHOSPHORESCENCE
S0
S1
T1
A = ABSORPTION
R1
R = RADIATIONLESS PROCESS
IC
R2
INTERNAL CONVERSION LIGHT CONVERTED TO HEAT
Radiationless transition between states withthe same spin number
S1 S0
S0
S1
T1
A = ABSORPTION
R1
R = RADIATIONLESS PROCESS
ISCT
R3
ISCS
R4
INTERSYSTEM CROSSING LIGHT CONVERTED TO HEAT
Radiationless transition between states with different spin number
S0T1
S0
S1
T1
A = ABSORPTION
R1
R = RADIATIONLESS PROCESS
F
FluorescenceRadiational transition between states withthe same spin number
S1 S0
S0
S1
T1
A = ABSORPTION
R1
R = RADIATIONLESS PROCESS
ISCT
R3
P
P F>>
Phosphoresence Radiational transition between states withdifferent spin number
S0T1
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