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High-order-harmonic generation of vibrating H_2~+ and D_2~+

机译：高阶谐波产生振动H_2〜+和D_2〜+

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摘要

We study the isotope effect on high-order-harmonic generation (HHG) of vibrating H_2~+ and D_2~+ molecular ions aligned parallel to the polarization of the laser field. The time-dependent Schr?dinger equation is solved accurately and efficiently by the time-dependent generalized pseudospectral and Fourier grid methods in three spatial coordinates, one of them being the internuclear separation and the other two describing the electronic motion. The laser pulses have a carrier wavelength of 800 nm and duration of 10 or 16 optical cycles. The peak intensities used in the calculations are 2×10~(14) and 3×10~(14) W/cm~2. The effect of nuclear vibration is visible in both H_2~+ and D_2~+ but more pronounced in the lighter H_2~+ molecule. Striking differences from the fixed nuclei case are a total disappearance of the traditional plateau in the HHG spectrum at the higher intensity and significant redshift of the harmonic peaks in the central part of the spectrum. These phenomena are explained based on the analysis of the dynamics of the nuclear vibrational wave packet.
机译：我们振动平行于激光场的极化对准H_2〜+和D_2〜+分子离子的研究高阶谐波产生（HHG）的同位素效应。依赖于时间的薛定谔方程在三个空间坐标，将它们作为核间分离和其他两个描述电子运动的一个精确和有效地解决了与时间相关的广义拟谱和傅立叶网格方法。激光脉冲具有800nm的载波波长和持续时间的10个或16个光周期。在计算中使用的峰强度是2×10〜（14）和3×10〜（14）W /厘米〜2。核振动的效果可见在这两个H_2〜+和D_2〜+，但较轻的H_2〜+分子中更为明显。从固定核壳体显着的差异是在以较高的强度和在光谱的中心部分中的谐波峰的红移显著的谐波谱传统高原的总消失。这些现象都是基于核振动波包的动力学分析解释。

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