Communication: XFAIMS-eXternal Field Ab Initio Multiple Spawning for electron-nuclear dynamics triggered by short laser pulses.

Communication: XFAIMS-eXternal Field Ab Initio Multiple Spawning for electron-nuclear dynamics triggered by short laser pulses.
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通讯:XFAIMS-e外部场从头开始多次生成,用于由短激光脉冲触发的电子-核动力学。

DOI:
10.1063/1.4967761
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发表时间:
2016
期刊:
The Journal of chemical physics
影响因子:
--
通讯作者:
T. Martínez
T. Martínez
中科院分区:
--
文献类型:
--
作者:
B. Mignolet;Basile F. E. Curchod;T. Martínez

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阿托科学是一个新兴领域,阿秒脉冲或少周期红外脉冲用于泵浦和探测分子的相关电子核运动。我们提出了轨迹引导的外部场从头多次生成 (XFAIMS) 方法,该方法可以“动态”模拟此类实验,从激光脉冲激发到碎片或非绝热弛豫到电子基态。对于 LiH 分子的光激发,我们表明,对于阿秒和飞秒激光脉冲,XFAIMS 给出的结果与数值精确的量子动力学模拟非常一致。然后,我们通过研究核运动对亚磺酸 (H2CSO) 光激发的影响,展示了 XFAIMS 模拟多原子分子动力学的能力。
Attoscience is an emerging field where attosecond pulses or few cycle IR pulses are used to pump and probe the correlated electron-nuclear motion of molecules. We present the trajectory-guided eXternal Field Ab Initio Multiple Spawning (XFAIMS) method that models such experiments "on-the-fly," from laser pulse excitation to fragmentation or nonadiabatic relaxation to the ground electronic state. For the photoexcitation of the LiH molecule, we show that XFAIMS gives results in close agreement with numerically exact quantum dynamics simulations, both for atto- and femtosecond laser pulses. We then show the ability of XFAIMS to model the dynamics in polyatomic molecules by studying the effect of nuclear motion on the photoexcitation of a sulfine (H2CSO).
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