交换作用对于原子极紫外光吸收谱的影响

Effect of Exchange on XUV Absorption Spectrum of Atoms

全同性原理要求电子波函数必须满足交换反对称性的条件,针对其对多电子系统的瞬态吸收谱产生的影响,运用Ritz变分法求出了具有全同反对称性的氦原子波函数。在此基础上,通过求解三能级模型并与不考虑电子交换作用的旧模型对比,在理论上研究了氦原子阿秒极紫外(XUV)光瞬态吸收谱。该研究突破传统所采用的单电子跃迁模型,重点考虑电子的交换作用对XUV光瞬态吸收谱的影响。研究发现该交换作用对该瞬态吸收谱的强度和吸收峰的位置等物理量都有重要的影响,该研究结果可为运用瞬态吸收谱探测原子内电子超快关联动力学提供参考。

The homogeneity principle requires that the electron wave function must satisfy the condition of exchange antisymmetry. In view of its influence on the transient absorption spectrum of multi-electron system, the helium atom wave function with identical anti-symmetry is obtained by Ritz variational method. On this basis, the transient absorption spectra of attosecond extreme ultraviolet(XUV) light of helium atoms are studied theoretically by solving the three energy level model and comparing with the old model without considering electron exchange. This study breaks through the traditional single-electron transition model and focuses on the effect of electron exchange on the transient absorption spectrum of XUV light. It is found that the exchange interaction has an important influence on the physical quantities, such as the intensity of the transient absorption spectrum and the position of the absorption peak. The results can provide a reference for using transient absorption spectrum to detect the ultrafast correlation dynamics of electrons in atoms.