Universality of the dynamic characteristic relationship between the characteristic time t _c and the two-electron Coulomb interaction energy of the ground state in the two-photon double ionization process is investigated via changing the parameters of the two-electron atomic system and the corresponding laser conditions. The numerical results show that the product keeps constant around 4.1 in the cases of changing the nucleus charge, the electron charge, the electron mass, and changing simultaneously the nucleus charge and the electron charge. These results demonstrate that the dynamic characteristic relationship in the two-photon double ionization process is universal. This work sheds more light on the dynamic characteristic relationship in ultrafast processes and may find its application in measurements of attosecond pulses.

通过改变双电子原子系统的参数和相应的激光条件，研究了双光子双电离过程中特征时间t _c与基态双电子库仑相互作用能的动态特性关系的普遍性。. 数值结果表明，产品在改变核电荷、电子电荷、电子质量以及同时改变核电荷和电子电荷的情况下，保持恒定在4.1左右。这些结果表明双光子双电离过程中的动态特性关系是普遍的。这项工作进一步阐明了超快过程中的动态特性关系，并可能在阿秒脉冲的测量中得到应用。