The molecular beam, laser-rf, double-resonance technique has been used to measure the electric-dipole moment of the X 2Σ+ (v=0) electronic ground state of CaF. The moment was determined to be 3.07(7) D by measuring the Stark shifts of rf transitions within specified rovibrational states of X 2Σ+.
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Childs et al. (1984) studied this question.
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