“…They are unstructured at 77°K and at this temperature are at somewhat higher energy than the bands observed in solution. 10 The spectra of various crystals, however, show other weak bands and interesting spectral features which must be explained. Most noticeable are weak broad bands at 12,020, 21,750, 22,430, 29,560, 31,210, and 34,930 cm"1 (not shown here), as well as fine structure on the 25,500-cm"1 band.…”