Extended analysis of the B2Σ+-X2Σ+ and A2Π-X2Σ+ systems of ZrN

•B2Σ+-X2Σ+ and A2Π-X2Σ+ systems of ZrN extended to higher vibrational levels.•(1,0), (1,1), (2,0), (2,1), (2,3) bands in B-X and (3,3) in A-X system observed.•Vibrational term energy up to ν″=5 levels for X2Σ+ state determined.•Equilibrium rotational constants for the B2Σ+ state determined.

Rotationally resolved spectra of (1,0), (1,1), (2,0), (2,1) and (2,3) bands of B2Σ+-X2Σ+ and (3,3) band of A2Π-X2Σ+ systems have been measured in a laser-induced fluorescence spectra of jet cooled ZrN molecule. Rotational analysis have been extended to include the levels ν=3 of X2Σ+, ν=1,2 of B2Σ+ and ν=3 of A2Π states. The vibrational constants of the X2Σ+ state have been determined. Perturbations were observed in all the rotational branches of the B-X system and A2Π1/2f-X2Σ+ subband.