Multispectrometer designed for various optical measurements, introduced in 1974, is first described. Behaviors of energy transfer in durene (1,2,4,5-tetramethylbenzene) crystal were studied by the use of this apparatus and previously constructed N2 laser. Emission spectra excited by ultraviolet light of 254 nm ranging from the near ultraviolet to visible parts were observed at room temperature and 77 K. The decaying process and temperature dependence of green emission (a characteristic of the durene crystal) were considered in relation to the intensity change of the near ultraviolet spectrum. Through these method, the mechanism of the green emission center and energy transfer in the durene crystal was discussed.
