Fourier transform emission spectroscopy of the E2Π-X2Σ+ transition of BaH

► Emission spectroscopy of the E-X transition of BaH. ► Rotational analysis of the 0-0, 1-1 and 2-2 bands. ► Least-squares fit of the E-X rotational lines combined with the known infrared data. ► Improved spectroscopic constants for the E state of the BaH.