In combustion research, nitromethane is an important nitro-compounded liquid propellant offering high performance. Additionally it can be used as a model substance for understanding mechanisms of combustion of solid propellants. The objectives of investigations were the burning behaviour and the¯ame spectrum in the UVaVIS spectral range because of the appearance of strong radical emissions also present in¯ames of other energetic materials. The evaluation is based on a detailed chemical kinetics and a linear combustion model including a reduced mechanism.

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Ytterbium metal powder burns with a luminous vapor phase diffusion flame in oxygen. Consolidated stoichiometric mixtures with both polytetrafluoroethylene and hexachloroethane upon ignition yield intense luminous flames. With UV/Vis spectroscopy of the combustion flames Yb, YbO, YbCl, and YbF species have been identified contributing to the selective emission in the green spectral range. The flame temperatures of ytterbium combustion in oxygen and with halocarbon based oxidizers are in the same range as for comparable magnesium based systems.