Accurate force constants from isotopic substitution in the NO-2radical in NaNO2

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Abstract
The v2 bending mode of the nitrite radical in NaNO2 has been studied in detail at 77 and 300K. The spectrum at 77K shows four distinct bands, the most intense being the fundamental due to the mass configuration O16N14O16, and having an absorption peak at 829 cm-1. Further bands, with shifts of -4.7 cm-1, -10.1 cm-1 and -19.5cm-1 have been accurately measured, assigned to various isotopic species, and used to calculate and verify a set of force constants for this molecular system. The three shifted bands have been shown to be due to the mss configurations 16O15N16O, 17O14N16O, 18O14N16O, respectively. A harmonic force field potential function has been used which shows excellent agreement with results.