Abstract
Infrared—spectra of the isotopic species 13CH 3ONO, CH 3 18ONO, CH 3O 15NO and CH 3ON 18O, isolated in argon matrices, are reported. Spectral data together with earlier data on CH 3ONO are used for derivation of 22 parameter harmonic valence force fields for both the cis and trans conformers and assignments are presented for all isotopic species in the two conformations. The valence force field will be used to propose assignments of cis and trans CD 3ONO reported earlier by O gilvie. A comparison of force constants of molecules with CO, NO, and NO fragments and their dependence on conformation and structure is made.
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