THE MAGNITUDE OF MOLAR ABSORPTIVITIES
Molar absorptivities range from zero up to a maximum on the order of 105 are observed. The magnitude of depends upon the probability for an energy-absorbing transition to occur. Peaks having molar absorptivities less than about 103 are classified as being of low intensity. They result from so-called forbidden transitions, which have probabilities of occurrence that are less than 0.01.