Isotope effect in hydrocarbon flame bands (deuterium substitution)

Abstract

By suitably modifying the apparatus for the production of the acetylene glow with atomic oxygen, a large number of deutero-hydrocarbon flame bands have been obtained in the spectrum and it has been possible to complete the analysis of the isotopic bands. These bands have been arranged into v ', v " arrays belonging to four groups. It has been shown that the first group of the isotopic system corresponds to the A group of ordinary hydrocarbon flame bands, while the bands in the second group are due to the CD stretching frequency and those in groups III and IV are due to the bending frequency. The problem of the emitter has been discussed and the evidence is strongly in favour of HCO.