Application of laser raman spectroscopy to analysis of isotopic C2 hydrocarbons in fusion fuel gas processing

Gaseous C2 hydrocarbons, which would be the major impurities after methane in plasma exhaust gases, were analyzed by laser Raman spectrometry. Deuterated C2 hydrocarbons, which were prepared by mixing acetylene, ethylene or ethane with D2 gas were experimentally measured. Suitable bands for quantitative analyses can be selected as the ν2 vibrations at 1,764 ∼ 1,973 cm-1, ν2 vibrations at 1,518 ∼ 1,627 cm-1 and some ν3 vibrations at 985 ∼ 1,344 cm-1, and ν3 vibrations at 824 ∼ 994 cm-1, for deuterated acetylenes, ethylenes and ethanes respectively. Those bands are based on the CC stretching vibrations, except for the deformation vibration ν3 of the ethylenes. Isotopic hydrocarbons in fusion fuel gas processing will be analyzed by using the same bands in laser Raman spectroscopy. (author)