Jet-cooled laser-induced fluorescence spectroscopy of LaH: Observation of new excited electronic states

► 1Σ+ symmetry for the ground state of LaH molecule confirmed. ► Three new excited electronic states, one with Ω = 0 and two with Ω = 1 observed. ► First observation of intercombination transition 0+(3Σ−)-X1Σ+ in LaH. ► Internuclear distances for new excited electronic states measured. ► Spectroscopic data on observed excited electronic states compared with ab initio results.