Kuleff Alexander I, Cederbaum Lorenz S
Theoretische Chemie, Universität Heidelberg, Im Neuenheimer Feld 229, 69120 Heidelberg, Germany.
Phys Rev Lett. 2007 Feb 23;98(8):083201. doi: 10.1103/PhysRevLett.98.083201.
Advances in laser pump-probe techniques open the door for observations in real time of ultrafast electronic processes. Particularly attractive is the visualization of interatomic processes where one can follow the energy transfer from one atom to another. The interatomic Coulombic decay (ICD) provides such a process which is abundant in nature. A wave packet propagation method now enables us to trace fully ab initio the electron dynamics of the process in real time and space, taking into account all electrons of the system and their correlations. The evolution of the electronic cloud during the ICD process in NeAr following Ne2s ionization is computed and analyzed. The process takes place on a femtosecond time scale, and a surprisingly strong response is found already in the attosecond regime.
激光泵浦-探测技术的进展为实时观测超快电子过程打开了大门。特别吸引人的是原子间过程的可视化，在这个过程中人们可以追踪能量从一个原子转移到另一个原子。原子间库仑衰变（ICD）提供了这样一个在自然界中很丰富的过程。现在一种波包传播方法使我们能够在考虑系统所有电子及其相关性的情况下，在实时间和空间中完全从头开始追踪该过程的电子动力学。计算并分析了在Ne2s电离后NeAr中ICD过程中电子云的演化。该过程发生在飞秒时间尺度上，并且已经在阿秒范围内发现了令人惊讶的强烈响应。
