Optical Analysis of 12 C/ 13 C and 12 C/ 14 C Ratios in Carbon Dioxide, by Measurements on the CO + Spectrum in the Wavelength Interval between 210 and 250 nm

Optical analysis of carbon isotopes by emission spectroscopy has been investigated by measuring the first negative band system of CO + . The optical analysis for the abundances of carbon-13 and carbon-14 can be carried out with a SD of 0.05 at. %.