Key points are not available for this paper at this time.
Singlet-triplet absorption bands are reported for a number of halogen benzenes and naphthalenes. Combining the results with other data, the rates of radiationless triplet to ground state transitions are found. The effect of the atomic number of a substituted halogen atom on the absorption strength is shown to agree with a simple theory. It is also shown that the spectroscopic moments of substituents do not add vectorially for singlet-triplet transitions.
McClure et al. (Mon,) studied this question.