Sub-Doppler laser spectroscopy of ZrN

Abstract

The (1,1) band of the A 2Π-X 2Σ + transition of ZrN has been studied using intermodulated laser induced fluorescence spectroscopy. The sub- Doppler spectrum obtained was at a resolution of about 150 MHz. The magnetic hyperfine structure caused by the 91ZrN nuclear (I = 5/2) is partially resolved, and the coupling of the nuclear spin angular momentum with X 2Σ + state conforms to case b(βs) scheme. This hyperfine interaction splits a rotational line into 12 hyperfine components which are divided into two groups with G = 2 (5 components) and G = 3 (7 components). The ground state molecular constants needed for explaining the observed hyperfine structures are: B = 0.479809 cm -1, D = 4.515x10 -1 cm -1 . γ = - 0.002445 cm -1, b = - 0.0645 cm -1, c = - 0.0045 cm -1.