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

摘要

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~3σ0~- transitions of ~(58)NiS (and ~(60)NiS). 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 ~(58)NiS.