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arXiv 2007.10179physics.atom-ph
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含时表面通量方法全维模拟$H_2^+$分子离解电离

A quantum simulation of dissociative ionization of $H_2^+$ in full dimensionality with time dependent surface flux method

Jinzhen Zhu

摘要:

通过求解含时的三粒子薛定谔方程,模拟了$H_2^+$在400 nm线偏振激光脉冲作用下的解离电离过程,并与量子化学计算结果进行了比较.联合能谱(JES)计算使用随时间变化的表面通量(tSurff)方法,其中的细节。计算得到的基态能量为-0.597原子单位,扣除质子动能项后的核间距为1.997原子单位,与量子化学计算的精确值一致。如果包括质子的动力学项,则基态能量为-0.592原子单位,核间距为2.05原子单位。在JES中观察到了能量共享现象,我们发现JES中关于核动能释放的峰值在$2\sim4$ eV以内,这与以前的二维计算(超过10 eV)不同,但与报道的实验值接近。在方位角上的投影能量分布表明,电子和质子倾向于在激光脉冲的偏振方向上离解。

英文摘要:

The dissociative ionization of $H_2^+$ in a linearly polarized, 400 nm laser pulse is simulated by solving a three-particle time-dependent Schrödinger equation in full dimensionality without using any data from quantum chemistry computation. The joint energy spectrum (JES) is computed using a time-dependent surface flux (tSurff) method, the details of which are given. The calculated ground energy is -0.597 atomic units and internuclear distance is 1.997 atomic units if the kinetic energy term of protons is excluded, consistent with the reported precise values from quantum chemistry computation. If the kinetic term of the protons is included, the ground energy is -0.592 atomic units with an internuclear distance 2.05 atomic units. Energy sharing is observed in JES and we find peak of the JES with respect to nuclear kinetic energy release (KER) is within $2\sim4$ eV, which is different from the previous two dimensional computations (over 10 eV), but is close to the reported experimental values. The projected energy distribution on azimuth angles shows that the electron and the protons tend to dissociate in the direction of polarization of the laser pulse.

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