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

TL;DR

This study used laser-induced fluorescence and dispersed fluorescence techniques to analyze NiS in the 450-560 nm range, discovering new vibronic transitions and providing detailed vibrational energy data for the ground state.

Contribution

First comprehensive spectroscopic analysis of NiS in this wavelength range, identifying new vibronic bands and determining ground-state vibrational parameters.

Findings

35 vibronic transition bands observed, 29 reported for the first time

Identified four vibrational progressions in NiS

Ground-state vibrational levels up to v''=6 measured

Abstract

Laser-induced fluorescence excitation spectrum of NiS in the wavelength range of 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 all the observed bands can be attributable to the [Omega = 0] - X^3 Sigma^- 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 v" = 6 as well as the vibrational frequency and the anharmonicity constant for the ground state of ^58 NiS.