The crystal spectrum of acenaphthene from 3200 Å to 2200 Å

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Abstract
The absolute intensity of absorption in the acenaphthene crystal spectrum has been measured at room temperature. The system at 2290 å in solution has intensity contributions from two electronic transitions—a strong, long-axis polarized transition and a weaker, short-axis transition. The absorption systems at 3000 å and 3200 å are assigned to short and long-axis transitions respectively. The intensity of the 3200 å system in the crystal is determined largely by quadrupole and octupole interactions, while the other stronger systems are understood in the simple dipole-dipole approximation.