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Photodissociation spectroscopy of Ca~+-formaldehyde

机译:Ca〜+-甲醛的光解离光谱

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We have carried out photodissociation spectroscopy studies of Ca~+ (H_2CO). The workis supported by electronic structure calcualtions of the ground and low-lying excited states of the complex. Our results show that Ca~+ (H_2CO) is bound ina C_(2v) Ca-O-CH_2 ground-state equilibrium geometry with a bond dissociation energy of D_e" (Ca-OCH_2)=0.9+-0.2eV.We have assigned five distinct molecular absorption bands of the complex that correlate with Ca~+-based 3d and 4p<-4s radiative transitions. The absorption bands show clear vibrational resonance structure with partiallyresolved rotational substructure. Spectrocopic constants are,for the msot part,ingood agreement with ab initio model predictions. The experimental data give quantitative informationa bout the bonding interactions for electronically excited states of different valence and molecular-orbital character.Results for Ca~+ (H_2CO) are compared with previous results from our lab on the analogous Mg~+ (H_2CO) complex.
机译:我们已经进行了Ca〜+(H_2CO)的光解离光谱研究。该工作得到了配合物的基态和低位激发态的电子结构计算的支持。我们的结果表明,Ca〜+(H_2CO)结合在C_(2v)Ca-O-CH_2基态平衡几何中,其键解离能为D_e“(Ca-OCH_2)= 0.9 + -0.2eV。我们已经分配了与Ca〜+基的3d和4p <-4s辐射跃迁相关的5个不同的分子吸收带,吸收带显示出清晰的振动共振结构和部分分解的旋转亚结构,光谱常数在许多方面与从头算模型预测。实验数据提供了关于不同价和分子轨道特性的电子激发态的键相互作用的定量信息。Ca〜+(H_2CO)的结果与我们实验室先前对类似Mg〜+的结果进行了比较(H_2CO)配合物。

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