A study of the à ²B₂-X̃ ²A ₁ band system of CaNH₂ employing molecular beam optical Stark spectroscopy

The 0₀⁰ à ²B₂-X̃ ²A₁ visible band system of a supersonic molecular beam sample of calcium amide, CaNH₂, recorded in the presence of a variable static electric field has been studied using high resolution laser induced fluorescence spectroscopy. The determined spectroscopic parameters are (in cm^-1), origin=15 464.366 9(8); A″=13.057 4(9); B″=0.30047(5); C″=0.292 88(5); ε_bb″ = 0.001 1(3); ε_cc″ = 0.001 1(3); A′ = 11.448 7(2); B′=0.3071(1); C′=0.2992(1); ε_aa′ = 8.238(2); ε_bb′ = 0.005 2(6); ε_cc′ = 0.055 7(6); Δ_k^s=-0.060 8(5). The rotational parameters are interpreted to give an approximate r₀ structure. The large spin-rotation parameter for the à ²B₂ state is discussed in terms of a second order spin-orbit interaction with other low-lying electronic states. Stark splitting of the ^PP₁₁(1.5) + ^PQ₁₂(0.5) branch feature was analyzed to produce a ground state permanent electric dipole moment, μ″, of 1.74(1) D. A comparison of μ″ with other monovalent calcium compounds is given.