ELECTRONIC AND MOLECULAR STRUCTURAL INVESTIGATIONS

V&lt；-N的光谱测量与分析 2，3-二氢丁二烯的转变导致了 对此振动子结构的重新解释 过渡。观察到的漫射子带显示出来自 跃迁到激发态的混合简正模，而不是 向C=C伸缩振动级数的转变 分子。过渡的扩散性被证明是由于 快速非辐射松弛通过或超过非常小的 势垒在C=C扭转到几乎简并的电子态。 通过对四甲基甲烷的光谱发射的研究 丁二烯，所讨论的两个态的能量顺序是 在TMB中观察到的与在丁二烯中观察到的相反。 丁二烯中受主态的可能类似物为 在基本上顺式的任何二烯中第一次被观察到 同分异构体，环戊二烯。 偏振选择共振多光子电离 对丙酮进行了光谱研究，以拆分 中激发态能量有序化存在的问题 那个分子。

The measurement and analysis of the spectrum of the V <- N transition of 2,3-dideuterobutadiene has lead to the reinterpretation of the vibrational substructure of this transition. The diffuse subbands observed were shown to arise from transitions to mixed normal modes of the excited state, not to transitions to a progression in the C=C stretching vibration of the molecule. The diffuseness of the transition was shown to be due to rapid nonradiative relaxation through or over a very small barrier in the C=C torsion to a almost degenerate electronic state. Through an investigation of the spectral emission of tetramethyl butadiene, the energy ordering of the two states in question was shown to be in inverted in TMB from that observed in butadiene. The probably analogue of the acceptor state in butadiene was observed for the first time in any diene in the essentially cis isomer, cyclopentadiene. A polarization-selected resonant multiphoton ionization spectroscopic investigation of acetone was conducted to resolve existing questions concerning the excited state energy ordering in that molecule.