Abstract
Totally 1195 transitions into the K 2 4 1 Σ g + v = 2 − 36, J = 1 − 85 ro-vibrational levels have been observed by infrared–infrared double resonance spectroscopy. Spin–orbit interaction between the 4 1 Σ g + state and the 2 3Π g Ω = 0 + state has been observed. Molecular constants, RKR potential curve, and spin–orbit interaction matrix element have been determined from the analysis of the experimental data.
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