The property of fluorescence that indicates that it is a spin-allowed process is to be stated. Whether the corresponding property explains the fact that phosphorescence is not spin allowed is to be stated. Concept introduction: Fluorescence is a process in which light is emitted from a substance after it absorbs a light. The process involves excitation of electrons and then the relaxation of that electron. The light emitted from the substance has lower energy than the light absorbed by the substance as some radiationless decay takes place.

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Chapter 15, Problem 15.56E

Interpretation Introduction

Interpretation:

The property of fluorescence that indicates that it is a spin-allowed process is to be stated. Whether the corresponding property explains the fact that phosphorescence is not spin allowed is to be stated.

Concept introduction:

Fluorescence is a process in which light is emitted from a substance after it absorbs a light. The process involves excitation of electrons and then the relaxation of that electron. The light emitted from the substance has lower energy than the light absorbed by the substance as some radiationless decay takes place.

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