论文标题
超快XUV辐照后，小分子的意外偶极子不稳定性
Unexpected dipole instabilities in small molecules after ultrafast XUV irradiation
论文作者
论文摘要
我们研究了在非常短的Xuv脉冲的影响下，小分子中单电子状态的耗竭。在n $ _2 $中，对于约50 eV的某些Xuv Energies的某些窗口，我们观察到一个明显的职业反转，即，最深绑定的价电子状态耗尽的情况比任何其他任何状态都大得多。这代表了一种现实的机制，该机制几乎可以立即切割到一个深处的状态下，这种情况通常是在许多能量超快过程的理论研究中被假定为临时的。这种占用反演还驱动偶极子不稳定性，即激光脉冲结束很久以后偶极信号的自发性重新出现并且偶极信号已经消失。从这种不稳定性中出现的偶极信号可以识别为光电子光谱中特定的低能结构。
We investigate the depletion of single-electron states in small molecules under the influence of very short XUV pulses. In N$_2$, for a certain window of XUV energies around 50 eV, we observe a marked occupation inversion, i.e. a situation where depletion of the deepest bound valence electron state is much larger than for any other state. This represents a realistic mechanism which is able to cut, almost instantaneously, a hole into a deep lying state, a situation which is often assumed ad hoc in numerous theoretical studies of energetic ultrafast processes. This occupation inversion furthermore drives a dipole instability, i.e. a spontaneous reappearance of the dipole signal long after the laser pulse is over and the dipole signal has died out. The dipole signal that emerges from this instability can be identified as a particular low-energy structure in photo-electron spectra.
