Observations and analysis of the K241Σg+ state using the infrared-infrared double resonance spectroscopy

Totally 1195 transitions into the K241Σg+ v = 2 − 36, J = 1 − 85 ro-vibrational levels have been observed by infrared-infrared double resonance spectroscopy. Spin-orbit interaction between the 41Σg+ state and the 23ΠgΩ = 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.