The nanosecond laser-photolysis system were studied with a repetitive nitrogen gas laser and with two different types of spectro-flashes. The first is the xenon flash with a few micr-osecond pulse duration. The laser trigger system consists of two successive spark-gap switches which are operated by a common trigger pulse to the xenon flash. The details of the actual construction of the coaxial-type nitrogen laser, gap switches, and trigger system are described. The second is the fluorescence of an organic dye solution excited by the nitrogen laser.
The laser pulse passes through the dye cell and also excites the adjacent sample solution.
The photo-physical properties of the pyrene solution were studied. The absorption spectra of the lowest excited singlet state to the higher excited states, of excimers, and of the lowest triplet state were observed. The time-resolved absorption spectra clearly show the photo-dynamic behaviors of these excited states. The characteristics of the present two methods are discussed.
