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Mass spectrometric analysis of the vapor in thermodynamic equilibrium with mixtures of Ta(s) and Ta2O5(s) has shown TaO and TaO2 to be the predominant gaseous molecules present. The experimental data yield 8.4±0.5 ev and 15.0±0.5 ev for the energies of atomization of these molecules at 0°K.
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Inghram et al. (1957) studied this question.
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