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Craig J. Eckhardt; Leo F. Nichols

doi:10.1103/PhysRevLett.29.1221

Observation of Excitons in a Molecular Liquid: Specular Reflection Spectrum of $α - M e t h y l n a p h t h a l e n e$

Craig J. Eckhardt and Leo F. Nichols

Phys. Rev. Lett. 29, 1221 – Published 30 October 1972

Abstract

The normal-incidence specular-reflection spectrum of liquid $α - m e t h y l n a p h t h a l e n e$ was obtained for the wavelength region from 215 to 400 nm. Comparison of the Kramers-Kronig transform of the reflection spectrum with the absorption spectrum of $α - m e t h y l n a p h t h a l e n e$ is cyclohexane shows the bands of the neat-liquid spectrum shift to lower energy and display significant broadening. These effects support the existence of excitons in molecular liquids.