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WHAT HAPPENS WHEN A MOLECULE ABSORBS LIGHT? t fates of absorbed light are presented in the next 1) INTERNAL CONVERSION 2) INTERSYSTEM CROSSING 3) FLUORESCENCE 4) PHOSPHORESCENCE

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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. - PowerPoint PPT Presentation

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Page 1: WHAT HAPPENS WHEN A MOLECULE ABSORBS LIGHT?

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

Page 2: WHAT HAPPENS WHEN A MOLECULE ABSORBS LIGHT?

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

Page 3: WHAT HAPPENS WHEN A MOLECULE ABSORBS LIGHT?

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

Page 4: WHAT HAPPENS WHEN A MOLECULE ABSORBS LIGHT?

S0

S1

T1

A = ABSORPTION

R1

R = RADIATIONLESS PROCESS

F

FluorescenceRadiational transition between states withthe same spin number

S1 S0

Page 5: WHAT HAPPENS WHEN A MOLECULE ABSORBS LIGHT?

S0

S1

T1

A = ABSORPTION

R1

R = RADIATIONLESS PROCESS

ISCT

R3

P

P F>>

Phosphoresence Radiational transition between states withdifferent spin number

S0T1

Page 6: WHAT HAPPENS WHEN A MOLECULE ABSORBS LIGHT?

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