Ristić, Vladimir M.Miladinovic, Tatjana B.Radulović, Mirko M.2023-03-092023-03-092008Ristić, V. M., T. B. Miladinović, and M. M. Radulović. "Analyzing the transition rates of the ionization of atoms by strong fields of a CO 2 laser including nonzero initial momenta." Laser physics 18 (2008): 1183-1187.1054-660Xhttps://scidar.kg.ac.rs/handle/123456789/17074This work was supported in part by the Ministry of Science and Ecology, Republic of Serbia (project no. 141023).Here, the method of including nonzero initial momenta for ejected electrons in strong infrared laser fields is further developed [8]. It has been shown that, apart from being natural, including the nonzero initial momenta enables one to go into a deeper analysis of the process of tunnel ionization of atoms in strong laser fields (intensity up to 1016 W/cm2 ). This is due to looking closely at Fig. 2, which indicates that all electrons that could be ejected, under the circumstances, are ejected at a field intensity ~1013 W/cm2 , and that the effect of ionization after that is strongly diminished, which can be seen from the slope of the plates on Figs. 2 and 4. This also explains the saturation effect for fields up to 1016 W/cm2 [1, 4, 5, 7], and probably this saturation goes on until the fields raising relativistic effects ~1018 W/cm2 [7]. Opposite to what was believed earlier [7], the atomic field intensities could be increased to values over 1017 W/cm2 only when more than 10 electrons are ejected from the atom, it is shown that the properly calculated ionization of 9 electrons increases the atomic field intensity to ~1018 W/cm2enarticle10.1134/S1054660X08100125