Abstract

The absorption spectrum of 1,2,4-trichlorobenzene at 2960–2600A has been investigated using a medium Hilger quartz spectrograph. The band system corresponds to a transition A′–A′ (1,2,4-C6H3Cl3 belongs to symmetry group Cs) with the transition moment lying in the molecular plane. The transition is allowed. In agreement with this assignment the 0–0 band appears strongly. Several progressions of symmetric vibrations and many combinations between them have been observed. A number of vibrational frequencies were identified with Raman frequencies. Characteristic of the spectrum is that its bands are spaced very regularly apart from each other, with a difference of about 30 cm−1 being most prominent. These differences represent vv transitions of low frequency vibrations.

© 1949 Optical Society of America

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