Multiphoton and tunneling ionization probability of atoms and molecules in an intense laser field

作者：Zhao Song Feng^*; Liu Lu; Zhou Xiao Xin

来源：Optics Communications, 2014, 313: 74-79.

DOI：10.1016/j.optcom.2013.09.074

• Multiphoton ionization
• Tunneling ionization
• Tunneling ionization models
• Time-dependent Schrodinger equation

We theoretically studied ionization of atoms exposed to an intense laser field by using three different methods, i.e., the numerical solution of the single-active-electron approximation based time-dependent Schrodinger equation (SAE-TDSE), the Perelomov-Popov-Terent'ev (PPT) model, and the Ammosov-Delone-Krainov (ADK) model. The ionization of several linear molecules in a strong laser held is also investigated with the molecular ADK (MO-ADK) and the molecular PPT (MO-PPT) model. We show that the ionization probability from the PPT and the MO-PPT model agrees well with the corresponding SAETDSE result in both the multiphoton and tunneling ionization regimes. By considering the volume effect of the laser held, the ionization signal obtained from the PPT and the MO-PPT model fits well the experimental data in the whole range of the multiphoton and tunneling ionization regimes. However, both the ADK and MO-ADK models seriously underestimate the ionization probabilities (or signals) in the multiphoton regime.

• 出版日期2014-2-15
• 单位西北师范大学