Infrared and far-infrared spectra of three isotopic modifications of the secondary ethylene ozonide isolated in solid argon are reported. Assignments are given for the vibrational spectra based on both empirical arguments and normal coordinate analysis. A 30-parameter harmonic force field is reported and fairly detailed analysis of the Fermi resonance of the CH2 stretching and bending modes is presented. Statistical thermodynamic functions of the normal species 12C21H4160s are tabulated.
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