Multiphoton and tunneling ionization of atoms in an intense laser field

• 作 者: 付妍卓 赵松峰 周效信
• 机 构: Key Laboratory of Atomic and Molecular Physics and Functional Materials of Gansu Province, College o
• 出 处: Chinese Physics B
• 发表日期: 2012年11期
• 关键词: tunneling ionization enough intense accord regime deviation consuming normalized

We study the ionization probabilities of atoms by a short laser pulse with three different theoretical methods,i.e.,the numerical solution of the time-dependent Schro¨dinger equation(TDSE),the Perelomov-Popov-Terent’ev(PPT) theory,and the Ammosov-Delone-Krainov(ADK) theory.Our results show that laser intensity dependent ionization probabilities of several atoms(i.e.,H,He,and Ne) obtained from the PPT theory accord quite well with the TDSE results both in the multiphoton and tunneling ionization regimes,while the ADK results fit well to the TDSE data only in the tunneling ionization regime.Our calculations also show that laser intensity dependent ionization probabilities of a H atom at three different laser wavelengths of 600 nm,800 nm,and 1200 nm obtained from the PPT theory are also in good agreement with those from the TDSE,while the ADK theory fails to give the wavelength dependence of ionization probability.Only when the laser wavelength is long enough,will the results of ADK be close to those of TDSE.

We study the ionization probabilities of atoms by a short laser pulse with three different theoretical methods, ie, the numerical solution of the time-dependent Schro¨dinger equation (TDSE), the Perelomov-Popov-Terent’ev (PPT) theory, and the Ammosov-Delone-Krainov (ADK) theory. These results show that laser intensity dependent ionization probabilities of several atoms (ie, H, He, and Ne) obtained from the PPT theory accordant well with the TDSE results both in the multiphoton and tunneling ionization regimes, while the ADK results fit well to the TDSE data only in the tunneling ionization regime. Our calculations also show that laser intensity dependent ionization probabilities of a H atom at three different laser wavelengths of 600 nm, 800 nm, and 1200 nm obtained from the PPT theory are also in good agreement with those from the TDSE, while the ADK theory fails to give the wavelength dependence of ionization probability. When the laser wavelength is long enough, will the results of ADK be c lose to those of TDSE