Classical mechanics is used to study the dynamical nature of the vibrational modes of a nonrigid molecule. This study reveals the existence of two qualitatively different sets of vibrational modes. One set is identified as local modes, while the other is identified as normal modes. These results are used to assign the observed vibrational structure of theCtilde;thinsp;1B2larr;Xtilde;thinsp;1A1, electronic transition of SO2. The implications for NO2, ClO2, and SeO2are discussed.
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