A system of physical chemistry - Index of

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A system of physical chemistry - Index of

THE HEAT OF REACTION 157

made the very important discovery that the fluorescence

(emission)

wave-length exhibited by a substance in one solvent is identical with the

absorption band exhibited by the same substance in a second solvent.

That is, under one set of conditions the substance is capable of absorbing

the wave-length which it emits as fluorescence under other

conditions.

In the " second " solvent it is conceivable that the conditions

exist for a reversal of the process (i.e. possibly Stokes' law is not

necessarily true in general). No information is available on this point

at the present time.

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