A study of the à 2B2–X̃ 2A1 band system of CaNH2 employing molecular beam optical Stark spectroscopy

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Abstract
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″=0.300 47(5); C″=0.292 88(5); εbb″=0.001 1(3); εcc″=0.001 1(3); A′=11.448 7(2); B′=0.307 1(1); C′=0.299 2(1); εaa′=8.238(2); εbb′=0.005 2(6); εcc′=0.055 7(6); Δsk=−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.