Polarization in strong-field ionization of excited helium
Polarization in strong-field ionization of excited helium
复制标题
激发氦的强场电离极化
DOI：
10.1088/1361-6455/ac2e4a
复制
发表时间：
2021
期刊：
影响因子：
--
通讯作者：
Bray A
中科院分区：
文献类型：
--
作者：
Bray A
我们分析了如何束缚态激发，电子交换和剩余的结合势的影响阈上电离（ATI）在氦准备在一个激发的p状态，平行和垂直于一个线性极化的中红外场。使用从头算B样条代数图解构造，和几个单电子方法与有效势，包括薛定谔求解器Qprop，强场近似（SFA）和库仑量子轨道强场近似的修改版本，我们发现，这些特定的物理机制留下显着的印记ATI光谱和光电子动量分布。例子包括高能光电子区域高达两个数量级的变化，以及可以追溯到库仑扭曲轨迹的斜坡状结构。目前的工作还表明，电子交换使再散射不那么有效，导致在ATI平台supplying。与传统方法的预测相反，由于长程势的存在，电子连续动力学不再局限于极化轴。因此，原则上可以探测垂直于驱动场偏振的激发态配置，而不需要正交偏振场。
We analyze how bound-state excitation, electron exchange and the residual binding potential influence above-threshold ionization (ATI) in helium prepared in an excited p state, oriented parallel and perpendicular to a linearly polarized mid-IR field. Using the ab initio B-spline algebraic diagrammatic construction, and several one-electron methods with effective potentials, including the Schrödinger solver Qprop, modified versions of the strong-field approximation (SFA) and the Coulomb quantum-orbit strong-field approximation, we find that these specific physical mechanisms leave significant imprints in ATI spectra and photoelectron momentum distributions. Examples are changes of up to two orders of magnitude in the high-energy photoelectron region, and ramp-like structures that can be traced back to Coulomb-distorted trajectories. The present work also shows that electron exchange renders rescattering less effective, causing suppressions in the ATI plateau. Due to the long-range potential, the electron continuum dynamics are no longer confined to the polarization axis, in contrast to the predictions of traditional approaches. Thus, one may in principle probe excited-state configurations perpendicular to the driving-field polarization without the need for orthogonally polarized fields.
剖析光电子全息术中的子周期干涉
影响因子：
2.9
作者：
Nicholas Werby;A. Maxwell;R. Forbes;P. Bucksbaum;C. F. D. M. Faria
通讯作者：
C. F. D. M. Faria
路径积分
DOI：
10.1007/978-981-15-6611-0_15
发表时间：
2020
期刊：
Mathematical Methods and Quantum Mathematics for Economics and Finance
影响因子：
--
作者：
Belal Ehsan Baaquie
通讯作者：
Belal Ehsan Baaquie