The crystal spectrum of naphthalene in the region 3200 Å to 2200 Å

The absolute intensity of absorption in the naphthalene crystal spectrum has been measured at room temperature. Measurements on the intense system at 2200 Å and on the system at 2850 Å of medium intensity are recorded for the first time along both the a and b crystal axes and indicate that the transitions are polarized along the long and short molecular axis respectively. The assignment of the weak system at 3200 Å as arising from a long axis transition is confirmed.