The Emission Spectrum of Benzene in the Region 2500-3000A

Abstract

The ultra-violet emission band spectrum of benzene vapor has been observed with a Tesla discharge as a means of excitation. The wave-lengths of over 100 bands lying between 2400 and 3000A have been measured with an accuracy of \ifmmode\pm\else\textpm\fi{}0.5A. It is found that the measurements are in general in agreement with those of McVicker, Marsh and Stewart. All the bands except the fainest and most diffuse ones may be represented by the following equations: ${\frac{1}{\ensuremath{\lambda}},=37485+924m\ensuremath{-}161n}{\frac{1}{\ensuremath{\lambda}},=37398+924m\ensuremath{-}162n}{\frac{1}{\ensuremath{\lambda}},=37485\ensuremath{-}986m\ensuremath{-}162n}$ ${\frac{1}{\ensuremath{\lambda}},=37425\ensuremath{-}986m\ensuremath{-}162n}{\frac{1}{\ensuremath{\lambda}},=37479\ensuremath{-}991m\ensuremath{-}162n}{\frac{1}{\ensuremath{\lambda}},=36412\ensuremath{-}991m\ensuremath{-}162n}$ where $m$ and $n$ are integers.The evidence supporting the conclusion that the bands are due to benzene and not to some decomposition product is summarized. The applicability of the data to spectroscopic analysis is also discussed.