强IR激光超短脉冲对双原子分子的电子激发和“级联”电离
Electron excitation and 'cascade' ionisation of diatomic molecules with ultra-short pulses of strong IR lasers
摘要：
实时研究了强度I>10^{13} W/cm^{2}的超短红外激光脉冲下分子电子激发和电离的动力学。多电子分子被模拟为两个活跃电子在冻结核场中运动的系统。以N $_{2}$分子和λ=800 nm，τ=5 fs的激光脉冲为例，计算了电子几率、电子能量和单电子/双电子电离几率随时间的变化关系。考虑了脉冲结束后分子的电子动力学行为.结果表明，在I \ge 10^{16} W/cm^{2}的强红外脉冲中，分子经历“级联”电离，其中一个电子以与一对电子相同的概率发射。
英文摘要：
The dynamics of molecular electron excitation and ionisation is studied in real-time for ultra-short IR laser pulses of intensity I>10^{13} W/cm^{2}. The multi-electron molecule is modeled by a system of two active electrons moving in a field of frozen core. The time dependences of electron probability, electron energy, and one-electron/two-electron ionisation probability are calculated for example of the N$_{2}$ molecule and the laser pulse with λ=800 nm, τ=5 fs. The electron dynamics of the pulse - excited molecule is considered also after the pulse end. The results show that in the strong IR pulses of I\ge 10^{16} W/cm^{2} the molecule undergoes a 'cascade' ionisation, where the one electron is emitted with the same probability as a pair of electrons.
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