Abstract
Nine vibrational bands have been found in the magnetic rotation spectrum (MRS) of the 3B 1u ← 1A g transition in pyrazine near 3700 Å; no MRS was observed for the region ascribed to the 1B 1u ← 1A g transition near 3200 Å. The origin band at 3727 Å exhibits a very sharp spike of negative sign near the band center and clearly resolvable rotational structure extending into the wings. Both the location and sign of rotation of the resolved structure are consistent with a case (b) model of the triplet state. The sign of the sharp spike is not explicable in terms of this model and suggests a different coupling scheme or more subtle effects in the MRS. This study provides the first clear correlation of sign of rotation in MRS with the rotational structure of a polyatomic electronic transition.
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