The paper presents our numerical simulations on single-electron Hz+ and two-electron H3+ systems with the symmetric split operator technique. The results show that the electron spectra are complementary to the conventional high-harmonic generation(HHG) spectra, the electron spectra feature peaks located at even harmonics, while the HHG spectra' peaks are at odd-numbered positions. Only limited values of the core-softening parameter can support HHG, and some preliminary explanation is given.%针对单电子H2+和双电子H3+系统,采用对称分裂算符法求解波函数的时间演化.计算了电子的含时频谱和体系的高次谐波谱,结果表明:电子频谱和高次谐波谱呈互补规律,即电子频谱峰值出现在基波的偶数倍频率位置,高次谐波则出现在奇数位置.对高次谐波谱随软化库仑参数的变化规律进行了数值研究,发现只在软化库仑参数的一定范围内才产生高次谐波,对该现象作了解释.
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