相对相位对双色激光场中线性多原子分子离子增强电离行为的影响

INFLUENCE OF RELATIVE PHASE ON THE ENHANCED IONIZATION BEHAVIOUR OF LINEAR MULTIATOMIC MOLECULAR IONS IN TWO-COLOR LASER FIELDS

利用短时指数传播子的对称分割法 ,数值求解了一维情况下的含时薛定谔方程 ,研究了一维多原子分子离子在双色 (基频 :780nm ,二倍频 :3 90nm)激光场中的增强电离行为 ,给出了相对相位对不同核间距处的电离概率的影响 .计算结果表明 ,在发生增强电离行为的核间距处 ,相对相位对电离概率的影响最为显著 .用标准静场电离模型给出了合理解释 .

The enhanced ionization(EI) behaviour of linear multiatomic molecular ions is studied in two-color(fundamental radiation: 780 nm, the second harmonic-390 nm) laser fields by the numerical solution of the time-dependent Schrodinger equation with the symmetrical splitting of the short-time exponential propagator. The influence of the relative phase between the two-color laser fields on the ionization probability is given. The numerical results demonstrate that the influence of the relative phase on the ionization probability is the strongest in the range of the inter-nuclear distance where the EI occurs. The influence can be explained in terms of the field-induced over-the-barrier ionization model.