The influence of symmetry breaking caused by charge transfer in excited quadrupole molecules of the D-π-A-π-D or A-π-D-π-A type, where A and D are the electron-acceptor and electron-donor groups, respectively, on spectra of characteristic vibrations is investigated. Types of possible changes in IR spectra with increase in molecule’s asymmetry are classified within the earlier developed theory of symmetry breaking and its manifestation in nonstationary IR spectra. Physical interpretation of the revealed trends is presented, and the latter are compared with currently available experimental data.

中文翻译：

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不对称电荷转移对激发四极分子红外光谱的影响

D-π-A-π-D或A-π-D-π-A型激发四极分子中电荷转移引起的对称破坏的影响，其中A和D为电子受体和电子给体分别研究了特征振动的频谱。随着分子不对称性的增加，红外光谱可能发生的变化类型归类于较早发展的对称性破坏理论及其在非平稳红外光谱中的表现。提出了揭示趋势的物理解释，并将后者与当前可用的实验数据进行了比较。