论文标题

激光诱导的HD分子动态比对,而无需Born-Oppenheimer近似

Laser-induced dynamic alignment of the HD molecule without the Born-Oppenheimer approximation

论文作者

Adamowicz, Ludwik, Kvaal, Simen, Lasser, Caroline, Pedersen, Thomas Bondo

论文摘要

激光诱导的分子比对在没有BO近似的情况下近似近似(BO)近似的框架中得到了充分的了解,但是,分子结构的概念丢失了,从而使对齐很难精确地定义。 In this work, we demonstrate the emergence of alignment from the first-ever non-BO quantum dynamics simulations, using the HD molecule exposed to ultrashort laser pulses as a few-body test case We extract the degree of alignment from the non-BO wave function by means of an operator expressed in terms of pseudo-proton coordinates that mimics the BO-based definition of alignment The only essential approximation, in addition to the物质场相互作用的半经典电 - 偶极近似是时间独立于显式相关的高斯基函数的选择。我们使用各种依赖电场的基础构建程序,这使我们能够保持基尺寸较低,同时捕获电动极化对核和电子自由度的主要影响。通过与两个一维模型系统的几乎精确的基于网格的模拟进行比较,可以验证基础设定的构建程序:在柔软有吸引力的库仑电势中激光驱动的电子动力学和摩尔斯电位中的核旋转动力学。

Laser-induced molecular alignment is well understood within the framework of the Born-Oppenheimer (BO) approximation Without the BO approximation, however, the concept of molecular structure is lost, making alignment hard to define precisely. In this work, we demonstrate the emergence of alignment from the first-ever non-BO quantum dynamics simulations, using the HD molecule exposed to ultrashort laser pulses as a few-body test case We extract the degree of alignment from the non-BO wave function by means of an operator expressed in terms of pseudo-proton coordinates that mimics the BO-based definition of alignment The only essential approximation, in addition to the semiclassical electric-dipole approximation for the matter-field interaction, is the choice of time-independent explicitly correlated Gaussian basis functions. We use a variational, electric-field-dependent basis-set construction procedure, which allows us to keep the basis-set dimension low whilst capturing the main effects of electric polarization on the nuclear and electronic degrees of freedom. The basis-set construction procedure is validated by comparing with virtually exact grid-based simulations for two one-dimensional model systems: laser-driven electron dynamics in a soft attractive Coulomb potential and nuclear rovibrational dynamics in a Morse potential.

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