TWO-PHOTON PHOTOACOUSTIC SPECTROSCOPY of S-TRIAZINE
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Date
1979
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Ohio State University
Abstract
With the advent of powerful (megawatt) tunable pulsed dye lasers, it becomes feasible to do two-photon spectroscopy with photoacoustic detection. Thus, molecular systems which do not fluoresce may be examined. Details of the experimental methods are presented. The ultraviolet spectroscopy of s-triazine, although much studied, is not well understood. The lowest singlet, for example, is thought to manifest a substantial Jahn-Teller effect which complicates the interpretation of the spectrum. Also, several electronic states that are believed to be in the 30,000-$40,000 cm^{-1}$, region have not been located. The use of two-photon photoacoustic spectroscopy to help solve these problems is discussed. For example, direct confirmation of the assignment of the lowest electronic state as $E^{\prime\prime} (D_{3h})$ is given.
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