Hyperfine structure of first negative system (B 2Σ+u–X 2Σ+g) of 14N+2 and 15N+2 from laser-induced fluorescence measurements

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Abstract
In this work, we present a study of the hyperfine structure of the (1,2) band of the first negative system (B 2Σ+u–X 2Σ+g) of 14N+2 and 15N+2 using laser-induced fluorescence with the fast ion beam laser spectroscopy technique. The hyperfine structure of 14N+2 and 15N+2 have been observed in 30 rotational lines (5≤N″≤19) of the (1,2) band of this system. The Fermi-contact (bF′,bF″) and dipolar (t′,t″) hyperfine parameters are given with their evolutions versus the vibrational quantum numbers. Furthermore, the hyperfine structure of 15N+2 led to the revision of the preliminary spin–rotation (γ′,γ″) constants. The hyperfine parameters for the (1,2) band in the B 2Σ+u–X 2Σ+g system have been determined for the first time.