论文标题
h $^{+} $+h $^{+} $分离频道的光电和碎片动力学在nh $ _3 $中以直接单光量双电离为单位
Photoelectron and fragmentation dynamics of the H$^{+}$ + H$^{+}$ dissociative channel in NH$_3$ following direct single-photon double ionization
论文作者
论文摘要
我们报告了H $^{+} $+H $^{+} $片段化通道的测量值，直接单光量在61.5 eV时中性NH $ _ {3} $的单光电离，其中两个光电子和两个质子使用3-D Momkum Imamm巧妙地测量了两个光电子和两个质子。我们基于我们的多差配置相互作用计算计算，我们确定了有助于H $^{+} $+H $^{+} $解离的四个dication电子状态。提出了这四种电子状态之间提取的分支比率。在四个dication电子状态中，三个在一致的过程中分离，而第四个则经历了顺序的片段化机制。我们发现证据表明，中性的NH片段或中间NH $^+$离子在RO振动上显着激发。我们还确定了两个光电子之间的相对发射角差异，这是它们在四种不同的疾病状态的能量共享的函数，这与先前对原子靶标的先前观察结果有些相似。
We report measurements on the H$^{+}$ + H$^{+}$ fragmentation channel following direct single-photon double ionization of neutral NH$_{3}$ at 61.5 eV, where the two photoelectrons and two protons are measured in coincidence using 3-D momentum imaging. We identify four dication electronic states that contribute to H$^{+}$ + H$^{+}$ dissociation, based on our multireference configuration-interaction calculations of the dication potential energy surfaces. The extracted branching ratios between these four dication electronic states are presented. Of the four dication electronic states, three dissociate in a concerted process, while the fourth undergoes a sequential fragmentation mechanism. We find evidence that the neutral NH fragment or intermediate NH$^+$ ion is markedly ro-vibrationally excited. We also identify differences in the relative emission angle between the two photoelectrons as a function of their energy sharing for the four different dication states, which bare some similarities to previous observations made on atomic targets.
