Zeeman electronic spectra of gaseous NO in very high magnetic fields up to 25 T

An apparatus for measuring the fluorescence excitation spectra of gaseous molecules in very high magnetic fields generated by a water-cooled resistive magnet has been developed. Spectra due to the A2Σ+ (v′=0)–X2Π (v″=0) transition of NO were measured in magnetic fields up to 25 T. The spectra show complicated line structures due to large Zeeman splitting in both the A2Σ+ and X2Π states. The transition energies and line intensities were calculated using Hundʹs case (a) basis set to assign the observed lines.