The Spectrum of Deuteroacetone in the Vacuum Ultraviolet A Comparison with the Spectrum of Acetone

The spectrum of acetone-d6 of over 90 percent purity has been photographed in the region 2000–1300A, with a dispersion of 4.14A per mm. Data for the transition at about 51,000 cm−1 are presented together with new data on acetone in the same region. A discussion of the normal state of the acetones is given, and an analysis is made of the electronic spectra. It is shown that no vibrational frequency near 1200 cm−1 appears in the excited state of acetone-d6 and that this frequency in acetone cannot be ascribed to the C–O vibration.