The molecularhyphen;beam electric resonance method served to measure the radiohyphen;frequency spectra of NaCl and to determine the hyperfine constants and the dipole moments for theugr;thinsp;equals;thinsp;0, 1, 2, and 3 vibrational levels of Na35Cl, and for theugr;thinsp;equals;thinsp;0and 1 vibrational levels of Na37Cl.
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