The absorption band of benzene lying at 6.75μ has been investigated under high resolution for both liquid and gaseous states. The spectrum for the vapor shows three distinct branches with evidence of unresolved fine structure. The liquid shows a less regular spectrum with a definite shift towards longer wave-lengths. In addition, some new water vapor lines in the 6.26μ band are reported.

• Received 5 July 1932

DOI:https://doi.org/10.1103/PhysRev.41.486