Abstract
Rotational transitions of 15N 35Cl and 15N 37Cl were observed in the submillimeter-wave region, and the observed spectrum was combined with the rotational and vibration-rotation spectra of other isotopic species previously reported to derive Born-Oppenheimer molecular constants. The breakdown of Born-Oppenheimer approximation has been clearly demonstrated for the rotational and spin-rotation interaction constants, whereas the effect was marginal for the spin-spin interaction constant. The equilibrium bond length has been recalculated from the B e constant thus corrected, to be 1.610 705 (19) Å, where the uncertainty given in parentheses is entirely due to that of Planck's constant.
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