Abstract

The absorption spectrum of benzotrifluoride vapor at 2750–2400A was photographed in a medium Hilger quartz spectrograph. The band system can be interpreted in terms of an electronic transition A1B1. The 0,0 band appears strongly at 37819 cm−1. Several progressions of totally symmetric vibrations occur involving particularly frequencies of 750, 926, and 961 cm−1. Other frequencies of 316, 538, 596, and 1031 cm−1 occur singly excited and in combination with the mentioned symmetric vibrations. Bands corresponding to the excitation of ground state frequencies up to 1336 cm−1 have been observed at higher pressures and found to coincide with Raman frequencies. The relation of the observed frequencies to modes of vibration is discussed. Spectral position and oscillator strength of the total electronic band is discussed in comparison to benzene, fluorobenzene and toluene.

© 1949 Optical Society of America

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