Spectroscopy of the a^3Σ_u^+ state and the coupling to the X^1Σ_g^+ state of K_2

A. Pashov, P. Popov, H. Knöckel +1

We report on high resolution Fourier-transform spectroscopy of fluorescence to the a^3Σ_u^+ state excited by two-photon or two-step excitation from the X^1Σ_g^+ state to the 2^3Π_g…