Extending teh studies of ICD in the time domain

实时观察原子间库仑衰变中的电子将为了解这一过程的基本原理提供新的见解。我们建议进行一项实验，通过使用汉堡自由电子激光(FLASH)提供的锁相太赫兹和扩展紫外线(EUV)辐射以及多粒子符合动量谱来实现这一点。在我们的实验中，我们将在太赫兹(条纹)场的存在下，通过来自闪光的超短(10-50飞秒)EUV光子脉冲来电离Ne二聚体。然后，条纹场与带电粒子发生动量交换，动量的大小取决于粒子的方向和太赫兹场的相位。由于我们打算以符合和动量分辨率测量反应中产生的所有粒子，我们能够通过划痕非常清楚地检测ICD电子的影响：在ICD中，离子和ICD电子的动能之和是一个常数。因此，与预期总和能量的偏差与条纹场施加在ICD电子上的能量直接相关。因此，可以针对每个事件提取关于ICD的时间动力学的信息。

Observing the electrons in an Interatomic Coulombic Decay in real time will offer novel insights into the fundamentals of this process. We propose to carry out an experiment doing exactly that, by using combined, phase locked THz and Extended UV (EUV) radiation, which is available at the Free Electron Laser in Hamburg (FLASH), together with multiparticle coincidence momentum spectroscopy. In our experiment, we will ionize Ne dimers by ultrashort (10-50 fs) EUV photon pulses from FLASH in the presence of a THz ('streaking') field. A momentum exchange of the streaking field with the charged particles will then take place, the value of which depends on the particle direction and on the phase of the THz field. As we intend to measure all particles produced in the reaction in coincidence and with momentum resolution, we are able to detect the effect of the ICD electrons by streaking very clearly: In ICD, the sum of kinetic energy of the ions and the ICD electron is a constant. Therefore deviations from the expected sum energy are directly related to the energy imposed onto the ICD electron by the streaking field. The information on the temporal dynamics of ICD can therefore be extracted for each event.