Molecular-beam optical Stark spectroscopy of ScO

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Abstract
The molecular‐beam optical Stark spectrum of the A 2∏(v=1)–X 2∑+(v=0) band system of ScO has been recorded and analyzed. The experimentally determined permanent electric dipole moments of the A 2∏3/2, A 2∏1/2, and X 2∑+ states are 4.06(3), 4.43(2), and 4.55(8) D, respectively. The determined hyperfine parameters for the A 2∏ state are a=135(1) MHz, d=177(2) MHz, and eQq0=−83(12) MHz. The spectroscopic parameters are interpreted in terms of plausible models for the electronic nature of the A 2∏ and X 2∑+ states and are compared with theoretical values.