论文标题
NH $ _2^{+} $+H $^{+} $和NH $^{+} $+h $+h $^{+h $^{+} $+h碎片频道NH $ _3 $的机制和动力学机理和动力学
Mechanisms and dynamics of the NH$_2^{+}$ + H$^{+}$ and NH$^{+}$ + H$^{+}$ + H fragmentation channels upon single-photon double ionization of NH$_3$
论文作者
论文摘要
我们在NH $ _2^{+} $+H $^{+} $和NH $^{+} $^{+H $+H $^{+h $^{+h $^{+h $^{+h $+h解离频道之后进行单次双重离子化后61.5 ev的中性NH $ _ {3} $ rmiment con和两个pocucation cone in con和con，我们介绍了国家选择性测量。成像。三种电子状态被确定为有助于NH $ _2^{+} $+H $^{+} $解离通道，其中三个状态中的一种激发在解离之前进行了交叉交叉，产生了冷NH $ _2^+$碎片。相比之下，其他两个状态直接分离，产生了大约1 eV的内部能量的RO振动型NH $ _2^+$片段。 NH $^{+} $+H $^{+} $+H通道是通过从三个中间疾病状态进行直接解离的，其中一个与NH $ _2^{+} $++H $+H $^{+} $ CHANNEL共享。我们发现自动化有助于每个双电离通道的证据。还介绍了两个光电子之间的相对发射角，以及分子分解的后坐轴与电离场的极化矢量之间的相对角度，以提供有关不同dication状态的光电离和光电分离机理的见解。
We present state-selective measurements on the NH$_2^{+}$ + H$^{+}$ and NH$^{+}$ + H$^{+}$ + H dissociation channels following single-photon double ionization at 61.5 eV of neutral NH$_{3}$, where the two photoelectrons and two cations are measured in coincidence using 3-D momentum imaging. Three dication electronic states are identified to contribute to the NH$_2^{+}$ + H$^{+}$ dissociation channel, where the excitation in one of the three states undergoes intersystem crossing prior to dissociation, producing a cold NH$_2^+$ fragment. In contrast, the other two states directly dissociate, producing a ro-vibrationally excited NH$_2^+$ fragment with roughly 1 eV of internal energy. The NH$^{+}$ + H$^{+}$ + H channel is fed by direct dissociation from three intermediate dication states, one of which is shared with the NH$_2^{+}$ + H$^{+}$ channel. We find evidence of autoionization contributing to each of the double ionization channels. The distributions of the relative emission angle between the two photoelectrons, as well as the relative angle between the recoil axis of the molecular breakup and the polarization vector of the ionizing field, are also presented to provide insight on both the photoionization and photodissociation mechanisms for the different dication states.
