The existence of gaseous CoF 4 a species with an unusually high degree of oxidation of the metal has been demonstrated by means of Knudsen effusion mass spectrometry and FTIR spectroscopy. The Knudsen effusion mass spectrometry method has been applied to investigate the gas-phase composition over the CoF 3 (s)−TbF 4 (s) system and to establish the optimum in situ conditions for CoF 4 synthesis. The electron impact mass spectrum of the CoF 4 molecule has been obtained. From the infrared spectrum of argon-isolated CoF 4 molecules, the Co−F stretching mode has been detected at 767.8 cm - 1 .
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Rau et al. (1999) studied this question.
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