Mass-Independent Dunham Analysis of the [7.7] Y 2Σ+ – X 2Πi and [16.3] A 2Σ- – X 2Πi Transitions of Copper Monoxide, CuO

•Combined analysis of A-X and Y-X electronic systems of CuO.•First analysis of electronic spectrum of 65CuO.•Mass-independent Dunham fit used with PGOPHER to obtain molecular constants.•Cu-isotope field-shift correction to the electronic excitation energy required in fit of Y-X system.