High resolution Fourier transform emission spectroscopy of the A2Π-X2Σ+ and B2Σ+-X2Σ+ systems of the 12C15N free radical

► High resolution electronic spectroscopy of C15N radical. ► Vibrational and rotational constants of X2Σ+, A2Π and B2Σ+ states. ► Useful for measuring 15N abundances in astronomy.