双电子H_3^+体系的高次谐波谱的数值模拟

Numerical Simulation on HHG Spectra of Two-Electron H_3^+ Model

提出了双电子H3+体系的一维计算模型。采用对称分裂算符法计算波函数的时间演化,数值模拟了在800nm波长激光脉冲作用下体系的高次谐波(HHG)谱性质。通过哈密顿算符中的电子相互作用项研究了电子间互作用对HHG谱的作用,结果发现电子间的相互作用对HHG谱性质的影响不大,但是会对截止频率有一定影响;还模拟了体系在不同核间距下的HHG谱的截止频率,发现较大的核间距的截止频率大于半经典三步模型给出的截止频率,并对其进行了初步分析。

The authors present a one-dimensional calculation model of H3^＋ , and the time-dependent wavefunction was obtained by the symmetric split-operator method. The authors investigated the high-order harmonic generation （HHG） properties of H3^＋ model exposed to 800 m-wavelength ultrashort laser pulse. The effect of electron interaction on the HHG spectra is less pro-found than at the cut-off frequency. We also calculated the HHG spectra for different internuclear separation values close to real-istic one. Most of the calculated cutoff frequencies are beyond the three-step model＇s prediction, and a preliminary scenario is suggested.