Stark and zeeman effects on the lower electronic states of s-triazine

A detailed optical study of the lower electronic states of s-triazine in a pure crystal at 1.8°K is presented. Stark and Zeeman experiments on these states give no support to previous assignments. The experiments indicate that the lowest triplet state observed in s-triazine corresponds to either a polar A″₁ state or to an E″ state in which the orbital angular momentum is completely quenched. Optical measurements on a very weak triplet state absorption at 28930.7 cm^?1 in s-triazine are also reported. The premilinary assignment of this line as a crystal field induced Davydov component is shown not to be inconsistent with its Zeeman effect.