Electron Relaxation and Molecular Vibrations: Triatomic Systems of the Firsthyphen;Row Elements, the Methyl Radical, and Diazomethane and Ketene

摘要

The wellhyphen;known secondhyphen;order perturbation method is used to correlate the bondndash;bond interaction constants in ground and excited electronic states of triatomic systems of the firsthyphen;row elements, and unusual force constants in diazomethane and ketene with the effect of electron relaxation. The thirdhyphen; and fourthhyphen;order perturbation schemes are used to determine qualitatively the contributions to the thirdhyphen; and fourthhyphen;order parts of the vibrational potential function of carbon dioxide, by the electron relaxation effect. The fourthhyphen;order theory is used to rationalize the negative anharmonicities observed in ketene, diazomethane, the methyl radical, and planar excited states of ammonia.