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The bands of the 3500 Ǻ transition of azulene-do and azulene-ds show two unequal peaks 2.3 cm-l apart, followed by closely spaced fine structure. These bands have been analysed as type A bands of a planar, prolate asymmetric top. Rotational constants for both molecules in the excited state have been determined. The fine structure is due to multiple line coincidences in the high-J, low-K region of the qP branch. To each multiple line can be attributed a running number n = J+m, where m = J-K-1. Given sufficient resolving power, such "lines" should be rather commonly observed in type A and type B bands of large, planar, prolate molecules.

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Twenty-one bands of the first triplet-singlet system of glyoxal (3A,-'A,) have been photographed in absorption and in magnetic rotation using high resolving power. Analysis yields the following vibrational frequencies for the molecule in the 3A, state: v2 = 1458.9 cm-', v4 = 963., cm-', v5 = 502., cm-', v, = 234.3 cm-', and v12 = 391., cm-'. These frequencies are very similar to those for glyoxal in the corresponding ' A , excited state.