Abstract
By using two-photon resonant ionisation and a thermionic diode detector, the collision-induced two-photon forbidden 6s2 1S-6snp 1P transitions (n>29) have been observed at P(Ba) approximately 0.13 Torr and P(Ar) approximately 15 Torr. The forbidden transitions are attributed to the dimer excimer Ba2 processes. The minimum quantum number, n approximately 28 is calculated by using the l-mixing model and perturbation theory, which is in good agreement with the authors' observation.
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