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The cross section of the inelastic transfer from Ba(6s6p 1P1) to Ba(6s6p 3P1,2) induced by collision with argon or helium is measured as a function of the collision energy. The existence of a 0.15 eV energy barrier in the formation of Ba(6s6p 3P1) is observed and allows to explain why Ba(6s6p 3P2) was the only product formed in a previous cell experiment.
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Visticot et al. (1990) studied this question.
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