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首页> 外文期刊>Journal of Physics, B. Atomic, Molecular and Optical Physics: An Institute of Physics Journal >Floquet calculation of harmonic generation from hydrogen molecular ions in strong monochromatic laser fields
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Floquet calculation of harmonic generation from hydrogen molecular ions in strong monochromatic laser fields

机译：在强单色激光场中氢分子离子产生谐波的Floquet计算

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摘要

We present Floquet calculations of high harmonic generation (HHG) for the lowest two electronic states of the H_2~+ ion by strong continuous-wave laser fields. We solve the non-Hermitian matrix problem to get accurate solutions to the periodic time-dependent Schr?dinger equation (TDSE) by applying a pseudospectral representation combined with a complex absorbing potential method. This represents an alternative approach to direct TDSE solutions to obtain the harmonic spectra for the ion. We compare our HHG rates for the lower and upper states of H_2~+, which correspond to the gerade and ungerade ground states in the field-free case, with previously obtained results in the literature. We show that the enhancement of the ionization rates at the critical internuclear separation R_c ≈ 8 au plays some role in the appearance of very strong harmonic orders n = 5-11 at λ = 1064 nm and n = 5-9 at λ = 800 nm and intensity I = 10~(14) Wcm~(-2).
机译：我们介绍了通过强连续波激光场对H_2〜+离子的最低两个电子态的高次谐波产生（HHG）的Floquet计算。我们通过应用伪谱表示与复杂吸收势方法相结合，解决了非Hermitian矩阵问题，以获得周期相关的薛定er方程（TDSE）的精确解。这代表了直接TDSE解决方案以获得离子谐波谱的另一种方法。我们将H_2〜+的上下状态的HHG速率与无场情况下的gerade和ungerade基态相对应，并与文献中先前获得的结果进行了比较。我们表明，在临界核间距R_c≈8 au处，电离速率的增强在出现非常强的谐波阶数（在λ= 1064 nm时为n = 5-11和在λ= 800 nm时为n = 5-9）中起一定作用强度I = 10〜（14）Wcm〜（-2）

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