Spectroscopy of nickel monosulfide in 450–560 nm by laser-induced fluorescence and dispersed fluorescence techniques

Laser-induced fluorescence excitation spectrum of NiS in the wavelength range 450–560 nm has been recorded and analyzed. Thirty-five vibronic transition bands have been observed, 29 of which are reported for the first time. Rotational analyses indicated that the observed bands can be attributable to the [ Ω = 0 ] - X 3 ∑ 0 - transitions of 58NiS (and 60NiS). Twenty-five bands have been suggested to be grouped into four vibrational progressions. Furthermore, through dispersed fluorescence measurements we directly obtained the energies for the ground-state vibrational levels up to υ ″ = 6 as well as the vibrational frequency and the anharmonicity constant for the ground state of 58NiS.