双共振激发多光子电离过程中电离光电子谱的量子相干调制

Quantum Coherent Modulation on Photoelectron Spectra in Two Resonant Multi-Photon Ionization Process

利用缀饰态和微扰理论,研究了双共振激发多光子电离过程中电离光电子谱的量子相干特性,讨论了强场作用下激发脉冲的面积和脉冲间的延迟对多光子电离光电子谱的影响.结果表明,脉冲面积和脉冲间的延迟对电离光电子谱有明显的调制作用.当第一个脉冲的面积和脉冲间的延迟选取合适时,实现了多光子电离光电子谱Autler-Townes分裂以及电离光电子谱中干涉条纹的控制,并且利用这一量子相干控制实现了粒子在两个缀饰态之间的选择性布居;第二个脉冲面积的变化不影响两个缀饰态上的粒子布居几率,但对电离光电子谱有着明显的调制作用.

The properties of the photoelectron spectra in two resonant multi-photon ionization process are studied by means of dressed state theory and perturbation theory. The influences on the photoelectron spectra by the area of the first pulse and the delay between two pulses are discussed under strong-field scheme. It is shown that the photoelectron spectra can be modulated by the areas of the two pulses and the delay between them. Control of Autler-Townes doublet and the interferences in doublet can be realized by the area of the first pulse and the delay between the two pulses. The selective population of dressed states （SPODS） also can be realized by this coherent quantum mechanism. The population of dressed states cannot be selected by the area of the second pulse, but obviously it can be modulated.