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超短激光脉冲对光致电离光谱角分布的影响。

Effects of ultrashort laser pulses on angular distributions of photoionization spectra.

机构信息

Department of Physics, Faculty of Science, University of Malaya, 50603, Kuala Lumpur, Malaysia.

Laboratoire de Chimie Théorique, Faculté des Sciences, Université de Sherbrooke, Sherbrooke, Québec, J1K 2R1, Canada.

出版信息

Sci Rep. 2017 Jul 27;7(1):6739. doi: 10.1038/s41598-017-05915-8.

DOI:10.1038/s41598-017-05915-8
PMID:28751648
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC5532372/
Abstract

We study the photoelectron spectra by intense laser pulses with arbitrary time dependence and phase within the Keldysh framework. An efficient semianalytical approach using analytical transition matrix elements for hydrogenic atoms in any initial state enables efficient and accurate computation of the photoionization probability at any observation point without saddle point approximation, providing comprehensive three dimensional photoelectron angular distribution for linear and elliptical polarizations, that reveal the intricate features and provide insights on the photoionization characteristics such as angular dispersions, shift and splitting of photoelectron peaks from the tunneling or above threshold ionization(ATI) regime to non-adiabatic(intermediate) and multiphoton ionization(MPI) regimes. This facilitates the study of the effects of various laser pulse parameters on the photoelectron spectra and their angular distributions. The photoelectron peaks occur at multiples of 2ħω for linear polarization while  odd-ordered peaks are suppressed in the direction perpendicular to the electric field. Short pulses create splitting and angular dispersion where the peaks are strongly correlated to the angles. For MPI and elliptical polarization with shorter pulses the peaks split into doublets and the first peak vanishes. The carrier envelope phase(CEP) significantly affects the ATI spectra while the Stark effect shifts the spectra of intermediate regime to higher energies due to interference.

摘要

我们在 Keldysh 框架内研究了具有任意时间依赖性和相位的强激光脉冲的光电子能谱。一种使用解析跃迁矩阵元的高效半解析方法，可用于任意初始态的类氢离子，无需鞍点近似即可有效地准确计算任意观察点的光离化概率，提供线性和椭圆偏振的全面三维光电子角分布，揭示复杂的特征，并提供有关光离化特性的见解，例如角分散、隧穿或阈上离化 (ATI) 区域到非绝热 (中间) 和多光子离化 (MPI) 区域的光电子峰的位移和分裂。这有助于研究各种激光脉冲参数对光电子能谱及其角分布的影响。光电子峰出现在线性偏振的 2ħω的整数倍处，而在垂直于电场的方向上，奇数阶峰被抑制。短脉冲会产生分裂和角分散，其中峰与角度强烈相关。对于 MPI 和具有较短脉冲的椭圆偏振，峰分裂为双峰，第一峰消失。载波包络相位 (CEP) 显著影响 ATI 光谱，而由于干涉，斯塔克效应会将中间区域的光谱移向更高的能量。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/609d/5532372/b46423b7a2e2/41598_2017_5915_Fig14_HTML.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/609d/5532372/0cc959d5d986/41598_2017_5915_Fig6_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/609d/5532372/9b0ea34f4265/41598_2017_5915_Fig7_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/609d/5532372/7216c8d68df7/41598_2017_5915_Fig8_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/609d/5532372/872396cce58b/41598_2017_5915_Fig9_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/609d/5532372/636e634b9dc1/41598_2017_5915_Fig10_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/609d/5532372/0b4ce79bbfdf/41598_2017_5915_Fig11_HTML.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/609d/5532372/0ba3486d6dc0/41598_2017_5915_Fig13_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/609d/5532372/b46423b7a2e2/41598_2017_5915_Fig14_HTML.jpg

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