State to state study of the dissociation of doubly charged carbon dioxide cations
State to state study of the dissociation of doubly charged carbon dioxide cations
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DOI：
10.1063/1.449569
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发表时间：
1985-12
影响因子：
4.4
通讯作者：
G. Dujardin;D. Winkoun
中科院分区：
文献类型：
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作者：
G. Dujardin;D. Winkoun
已经通过光电离子-光电离子符合 (PIPICO) 方法在 37-52 eV 的光子能量范围内研究了 CO2 的双光电离。观察到 CO++2 的三种离解电子态（α、β 和 γ），阈值能量分别为 37.9、40.5 和 45.0 eV。将这些能量与 Flament 等人最近计算的能量进行比较。表明 37.9 eV 处的最低电子态很可能对应于 1Σ+g 态（1π−2g 主构型）。 CO++2 在其 α、β 和 γ 状态下解离成具有高放热性的 CO++O+，因为释放的总动能分别为 4.5、6.5 和 9.4 eV。根据这些结果，我们得出结论，α(1Σ+g ) 状态下的 CO++2 通过间接过程（预解离）解离为 CO+(X 2Σ+)+O+(4Su)。部分双光电离截面 σ++n (E) (n=α、β 和 γ) 的绝对值也被确定为光子激发能 E 的函数。双光电离与总光电离的比率...
Double photoionization of CO2 has been studied in the photon energy range 37–52 eV by the photoion–photoion coincidence (PIPICO) method. Three dissociative electronic states (α, β, and γ) of CO++2 have been observed with threshold energies at, respectively, 37.9, 40.5, and 45.0 eV. Comparison of these energies with those recently calculated by Flament et al. indicates that the lowest electronic state at 37.9 eV most probably corresponds to the 1∑+g state (1π−2g main configuration). CO++2 in its α, β, and γ states dissociates into CO++O+ with a high exothermicity since the total kinetic energy released was found to be respectively 4.5, 6.5, and 9.4 eV. From these results we concluded that CO++2 in its α(1∑+g ) state dissociates into CO+(X 2∑+)+O+(4Su) via an indirect process (predissociation). Absolute values of the partial double photoionization cross sections σ++n (E) (n≡α, β, and γ) were also determined as a function of the photon excitation energy E. A ratio of double to total photoionizatio...