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Nondipolar photoelectron angular distributions from fixed-in-space N2 molecules 来自固定空间 N2 分子的非极性光电子角分布
IF 1.6 4区 物理与天体物理 Q3 OPTICS Pub Date : 2024-06-25 DOI: 10.1088/1361-6455/ad5893
D V Rezvan, A Pier, S Grundmann, N M Novikovskiy, N Anders, M Kircher, N Melzer, F Trinter, M S Schöffler, T Jahnke, R Dörner and Ph V Demekhin
We investigate experimentally and theoretically the N 1s photoionization of fixed-in-space N2 molecules at a photon energy of 880 eV. In our experiment, we employed circularly polarized synchrotron radiation for the photoionization and coincident electron and fragment-ion detection using cold target recoil ion momentum spectroscopy. The accompanying angle-resolved calculations were carried out by the multichannel single-center method and code within the frozen-core Hartree–Fock approximation. The computed emission distributions exhibit two distinct features along the molecular axis, which are the results of a superposition of the direct and nearest-neighbor scattering amplitudes for the photoemission from two nitrogen atoms. In the electric-dipole approximation, these peaks are symmetric with respect to both nitrogen atoms. Including nondipole (retardation) effects in the calculations results in a simultaneous increase and decrease of the scattering peaks towards the nitrogen atoms pointing in the forward and backward directions along the light propagation, respectively. These theoretical findings are in agreement with our experimental findings.
我们从实验和理论上研究了光子能量为 880 eV 时固定在空间中的 N2 分子的 N 1s 光离子化。在实验中,我们采用了圆偏振同步辐射进行光离子化,并利用冷靶反冲离子动量谱进行了电子和碎片离子的同步探测。伴随的角度分辨计算是通过多通道单中心方法和冷冻核心哈特里-福克近似代码进行的。计算得出的发射分布沿分子轴线呈现出两个明显的特征,这是两个氮原子光发射的直接散射和近邻散射振幅叠加的结果。在电偶极子近似中,这些峰值相对于两个氮原子是对称的。将非偶极子(延迟)效应纳入计算会导致散射峰同时增大和减小,分别指向沿光传播的前向和后向的氮原子。这些理论结果与我们的实验结果一致。
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引用次数: 0
Controlling dark solitons on the healing length scale 在愈合长度尺度上控制暗孤子
IF 1.6 4区 物理与天体物理 Q3 OPTICS Pub Date : 2024-06-25 DOI: 10.1088/1361-6455/ad5895
Ling-Zheng Meng, Li-Chen Zhao, Thomas Busch and Yongping Zhang
While usually the optical diffraction limit is setting a limit for the lengthscales on which a typical alkali Bose–Einstein condensate can be controlled, we show that in certain situations control via matter waves can achieve smaller resolutions. For this we consider a small number of impurity atoms which are trapped inside the density dip of a dark soliton state and show that any grey soliton state can be obtained by selectively driving the impurity atoms. This allows to fully control the position and velocity of the dark soliton, and also study controlled collisions between these non-linear objects.
通常,光学衍射极限为控制典型碱玻色-爱因斯坦凝聚态的长度尺度设定了限制,而我们的研究表明,在某些情况下,通过物质波控制可以实现更小的分辨率。为此,我们考虑了被困在暗孤子态密度倾角内的少量杂质原子,并证明通过选择性地驱动杂质原子,可以获得任何灰色孤子态。这样就可以完全控制暗孤子的位置和速度,还可以研究这些非线性物体之间的受控碰撞。
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引用次数: 0
Boson bloom 玻色子开花
IF 1.6 4区 物理与天体物理 Q3 OPTICS Pub Date : 2024-06-16 DOI: 10.1088/1361-6455/ad3ff4
G Baskaran and A R May
The year 2024 marks the 100th anniversary of the first article on Bose statistics. Bose breathed life into the Planck distribution of radiation by a microscopic derivation (Bose 1924 Z. Phys.26 178), adding a new insight, namely indistinguishability into the then evolving quantum theory. Einstein recognized the importance of this article and got it published. Using Bose statistics Einstein wrote an article on the theory (Einstein 1924 Sutzungsber. Preuss. Akad. Wiss Phys.-Math Kl. 261) of an ideal Bose gas and Bose–Einstein condensation. The groundbreaking discovery of Bose, an unveiling of a secret of quantum mechanics, continues to reverberate after a century. Bose’s paper is considered the fourth important paper in old quantum theory, following Planck’s (1900) article (Planck 1900 Verh. Disch Phys. Ges.2 202), Einstein’s (1905) photoelectric effect (Einstein 1905 Ann. Phys., Lpz.17 132) and Bohr’s model (1913) of the atom (Bohr 1913 London, Edinburgh Dublin Phil. Mag. J. Sci.26 1). Dirac (1926 Proc. R. Soc. A 112 661) coined the name boson for one of the two families of indistinguishable particles, the other family being fermion. The edifice of modern quantum field theory, many-body quantum theory, quantum-information and quantum-computing are built on bosons, fermions and anyons. The ever-blooming quantum garden of bosons has photons, gluons, W-bosons, mesons, Higgs-bosons, gravitons, phonons, magnons, excitons, plasmons, polaritons and so on. We present a brief historical account of Bose’s life and his discovery, followed by a bird’s eye view of the impacts of bosons in modern science and technology: from Bose’s distribution of 3-degree background radiation reaching us in the form of cosmic microwave background from the big bang era to boson sampling, a novel quantum computing method. Bosogenesis before Baryogenesis?: And God said, Let there be light: and there was light (Genesis, 1:4)
2024 年是第一篇关于玻色统计的文章发表 100 周年。玻色通过微观推导为普朗克辐射分布注入了活力(玻色,1924 年,Z. Phys.26 178),为当时不断发展的量子理论增添了新的见解,即不可分性。爱因斯坦认识到这篇文章的重要性,并将其发表。爱因斯坦利用玻色统计写了一篇关于理想玻色气体和玻色-爱因斯坦凝聚理论的文章(爱因斯坦,1924 年,Sutzungsber.玻色的这一开创性发现揭开了量子力学的秘密,在一个世纪后仍回荡在人们的耳畔。玻色的论文被认为是继普朗克(1900 年)的文章 (Planck 1900 Verh. Disch Phys. Ges.2 202)、爱因斯坦(1905 年)的光电效应 (Einstein 1905 Ann. Phys., Lpz.17 132) 和玻尔(1913 年)的原子模型 (Bohr 1913 London, Edinburgh Dublin Phil. Mag. J. Sci.26 1) 之后,旧量子理论的第四篇重要论文。狄拉克(Proc. R. Soc. A 112 661,1926 年)创造了玻色子(boson)这一名称,用于表示不可区分的两类粒子中的一类,另一类是费米子(fermion)。现代量子场论、多体量子理论、量子信息和量子计算的大厦都建立在玻色子、费米子和任子的基础上。玻色子的量子花园里有光子、胶子、W 玻色子、介子、希格斯玻色子、引力子、声子、磁子、激子、质子、极化子等等。我们将简要介绍玻色的生平和他的发现,然后鸟瞰玻色子在现代科学和技术中的影响:从玻色的 3 度背景辐射分布,到大爆炸时代以宇宙微波背景的形式到达我们身边,再到玻色子采样--一种新颖的量子计算方法。重子发生之前的玻色子发生?上帝说:要有光,于是就有了(创世纪,1:4)
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引用次数: 0
Spatial calibration of high-density absorption imaging 高密度吸收成像的空间校准
IF 1.6 4区 物理与天体物理 Q3 OPTICS Pub Date : 2024-06-13 DOI: 10.1088/1361-6455/ad53ae
T Vibel, M B Christensen, M A Kristensen, J J Thuesen, L N Stokholm, C A Weidner and J J Arlt
The accurate determination of atom numbers is an ubiquitous problem in the field of ultracold atoms. For modest atom numbers, absolute calibration techniques are available, however, for large numbers and high densities, the available techniques neglect many-body scattering processes. Here, a spatial calibration technique for time-of-flight absorption images of ultracold atomic clouds is presented. The calibration is obtained from radially averaged absorption images and we provide a practical guide to the calibration process. It is shown that the calibration coefficient scales linearly with optical density and depends on the absorbed photon number for the experimental conditions explored here. This allows for the direct inclusion of a spatially dependent calibration in the image analysis. For typical ultracold atom clouds the spatial calibration technique leads to corrections in the detected atom number up to and temperature up to in comparison to previous calibration techniques. The technique presented here addresses a major difficulty in absorption imaging of ultracold atomic clouds and prompts further theoretical work to understand the scattering processes in ultracold dense clouds of atoms for accurate atom number calibration.
准确测定原子序数是超冷原子领域普遍存在的问题。对于原子数量不多的情况,可以使用绝对校准技术,但对于原子数量多、密度高的情况,现有技术会忽略多体散射过程。本文介绍了超冷原子云飞行时间吸收图像的空间校准技术。校准是从径向平均吸收图像中获得的,我们提供了校准过程的实用指南。研究表明,在本文探讨的实验条件下,校准系数与光密度成线性比例,并取决于吸收的光子数。这样就可以在图像分析中直接加入空间相关校准。对于典型的超冷原子云,与之前的校准技术相比,空间校准技术可以对探测到的原子数和温度进行校正。本文介绍的技术解决了超冷原子云吸收成像中的一个主要难题,并推动了进一步的理论研究工作,以了解超冷致密原子云中的散射过程,从而实现精确的原子数校准。
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引用次数: 0
Effects of p-wave interactions on Borromean Efimov trimers in heavy–light Fermi systems p 波相互作用对重光费米系统中 Borromean Efimov 三聚体的影响
IF 1.6 4区 物理与天体物理 Q3 OPTICS Pub Date : 2024-06-07 DOI: 10.1088/1361-6455/ad4fd2
Cai-Yun Zhao, Hui-Li Han, Ting-Yun Shi
We investigate the effects of p-wave interactions on Efimov trimers in systems comprising two identical heavy fermions and a light particle, with mass ratios larger than 13.6. Our focus lies on the Borromean regime where the ground-state trimer exists in the absence of dimers. Using pair-wise Lennard–Jones potentials and concentrating on the Lπ=1 symmetry, we explore the critical value of the interspecies s-wave scattering length ac at which the Borromean state appears in several two-component particle systems. Our exploration encompasses the universal properties of ac and the influence of p-wave fermion–fermion interactions on its value. We find that, in the absence of p-wave fermion–fermion interactions, ac is determined universally by the van der Waals radius and mass ratio. However, the introduction of p-wave fermion–fermion interactions unveiled a departure from this universality. Our calculations show that the critical interspecies scattering length ac now depends on the details of the fermion–fermion p-wave interaction. And, the presence of p-wave fermion–fermion interactions favors the formation of the Borromean state. Additionally, our investigation reveals that Efimov effect in the 1 symmetry persist even when the fermion–fermion interaction reaches the p-wave unitary limit.
我们研究了在由两个相同的重费米子和一个质量比大于 13.6 的轻粒子组成的系统中,p 波相互作用对埃菲莫夫三聚体的影响。我们的研究重点是在没有二聚体的情况下存在基态三聚体的 Borromean 体系。我们利用成对的伦纳德-琼斯电势,集中研究了 Lπ=1- 对称性,探索了几种双组分粒子系统中出现波罗曼态的种间 s 波散射长度 ac 的临界值。我们的探索包括 ac 的普遍特性以及 p 波费米子-费米子相互作用对其值的影响。我们发现,在没有 p 波费米子-费米子相互作用的情况下,ac 通常由范德华半径和质量比决定。然而,p 波费米子-费米子相互作用的引入揭示了这一普遍性的偏离。我们的计算表明,临界种间散射长度 ac 现在取决于费米子-费米子 p 波相互作用的细节。而且,费米子-费米子 p 波相互作用的存在有利于波罗莫态的形成。此外,我们的研究还发现,即使费米子与费米子的相互作用达到了 p 波单元极限,1 对称中的埃菲莫夫效应仍然存在。
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引用次数: 0
Introduction to theoretical and experimental aspects of quantum optimal control 量子优化控制理论与实验简介
IF 1.6 4区 物理与天体物理 Q3 OPTICS Pub Date : 2024-06-02 DOI: 10.1088/1361-6455/ad46a5
Q Ansel, E Dionis, F Arrouas, B Peaudecerf, S Guérin, D Guéry-Odelin and D Sugny
Quantum optimal control (QOC) is a set of methods for designing time-varying electromagnetic fields to perform operations in quantum technologies. This tutorial paper introduces the basic elements of this theory based on the Pontryagin maximum principle, in a physicist-friendly way. An analogy with classical Lagrangian and Hamiltonian mechanics is proposed to present the main results used in this field. Emphasis is placed on the different numerical algorithms to solve a QOC problem. Several examples ranging from the control of two-level quantum systems to that of Bose–Einstein condensates (BECs) in a one-dimensional optical lattice are studied in detail, using both analytical and numerical methods. Codes based on shooting method and gradient-based algorithms are provided. The connection between optimal processes and the quantum speed limit is also discussed in two-level quantum systems. In the case of BEC, the experimental implementation of optimal control protocols is described, both for two-level and many-level cases, with the current constraints and limitations of such platforms. This presentation is illustrated by the corresponding experimental results.
量子优化控制(QOC)是一套设计时变电磁场的方法,用于执行量子技术中的操作。这篇教程论文以物理学家易于理解的方式,介绍了基于庞特里亚金最大原理的这一理论的基本要素。通过与经典拉格朗日力学和汉密尔顿力学的类比,介绍了该领域使用的主要成果。重点放在解决 QOC 问题的不同数值算法上。使用分析和数值方法详细研究了从两级量子系统控制到一维光学晶格中的玻色-爱因斯坦凝聚体(BECs)控制等几个例子。提供了基于射击法和梯度算法的代码。此外,还讨论了两级量子系统中最优过程与量子速度极限之间的联系。在 BEC 的情况下,介绍了最优控制协议的实验实施,包括两级和多级情况,以及此类平台当前的约束和限制。相应的实验结果对此进行了说明。
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引用次数: 0
R-Matrix calculations for opacities: II. Photoionization and oscillator strengths of iron ions Fe xvii, Fe xviii and Fe xix 不透明的 R 矩阵计算:II.铁离子 Fe xvii、Fe xviii 和 Fe xix 的光离子化和振子强度
IF 1.6 4区 物理与天体物理 Q3 OPTICS Pub Date : 2024-05-16 DOI: 10.1088/1361-6455/ad4241
S N Nahar, L Zhao, W Eissner and A K Pradhan
Iron is the dominant heavy element that plays an important role in radiation transport in stellar interiors. Owing to its abundance and large number of bound levels and transitions, iron ions determine the opacity more than any other astrophysically abundant element. A few iron ions constitute the abundance and opacity of iron at the base of the convection zone (BCZ) at the boundary between the solar convection and radiative zones and are the focus of the present study. Together, Fe xvii, Fe xviii and Fe xix represent 85% of iron ion fractions, 20%, 39% and 26% respectively, at the BCZ physical conditions of temperature T ∼ K and electron density = c.c. We report the most extensive R-matrix atomic calculations for these ions for bound–bound and bound–free transitions, the two main processes of radiation absorption. We consider wavefunction expansions with 218 target or core ion fine structure levels of Fe xviii for Fe xvii, 276 levels of Fe xix for Fe xviii, in the Breit–Pauli R-matrix (BPRM) approximation, and 180 LS terms (equivalent to 415 fine structure levels) of Fe xx for Fe xix calculations. These large target expansions, which include core ion excitations to n = 2,3,4 complexes, enable accuracy and convergence of photoionization cross sections, as well as the inclusion of high lying resonances. The resulting R-matrix datasets include 454 bound levels for Fe xvii, 1,174 levels for Fe xviii, and 1,626 for Fe xix up to 10 and l = 0–9. Corresponding datasets of oscillator strengths for photoabsorption are: 20 951 transitions for Fe xvii, 141 869 for Fe xviii, and 289 291 for Fe xix. Photoionization cross sections have been obtained for all bound fine structure levels of Fe xvii and Fe xviii, and for 900 bound LS states of Fe xix. Selected results demonstrating prominent characteristic features of photoionization are presented, particularly the strong Seaton photoexcitation-of-core resonances formed via high-lying core excitations with that significantly impact bound–free opacity.
铁是主要的重元素,在恒星内部的辐射传输中发挥着重要作用。由于其丰度和大量的束缚水平和跃迁,铁离子比任何其他天体物理丰度元素都更能决定不透明度。在太阳对流区和辐射区边界的对流区底部,一些铁离子构成了铁的丰度和不透明度,是本次研究的重点。在温度 T ∼ K 和电子密度 = c.c 的 BCZ 物理条件下,Fe xvii、Fe xviii 和 Fe xix 合在一起占铁离子分数的 85%,分别为 20%、39% 和 26%。在布雷特-保利 R 矩阵(BPRM)近似中,我们考虑了 Fe xviii 的 218 个目标或核心离子精细结构水平的波函数展开,Fe xix 的 276 个水平的 Fe xviii,以及 Fe xx 的 180 个 LS 项(相当于 415 个精细结构水平)的 Fe xix 计算。这些大目标扩展包括了对 n = 2、3、4 复合物的核心离子激发,从而保证了光离子化截面的准确性和收敛性,并包含了高位共振。由此产生的 R 矩阵数据集包括铁 xvii 的 454 个束缚水平、铁 xviii 的 1,174 个束缚水平和铁 xix 的 1,626 个束缚水平,最高可达 10 和 l = 0-9。相应的光吸收振子强度数据集包括铁 xvii 的 20 951 个跃迁、铁 xviii 的 141 869 个跃迁和铁 xix 的 289 291 个跃迁。已经获得了 Fe xvii 和 Fe xviii 的所有束缚精细结构水平以及 Fe xix 的 900 个束缚 LS 状态的光离子化截面。部分结果展示了光离子化的显著特征,特别是通过高位核心激发形成的强 Seaton 光激发核心共振,对无束缚不透明度产生了重大影响。
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引用次数: 0
R-matrix calculations for opacities: I. Methodology and computations 不透明度的 R 矩阵计算:I. 方法和计算
IF 1.6 4区 物理与天体物理 Q3 OPTICS Pub Date : 2024-05-16 DOI: 10.1088/1361-6455/ad421c
A K Pradhan, S N Nahar and W Eissner
An extended version of the R-matrix methodology is presented for calculation of radiative parameters for improved plasma opacities. Contrast and comparisons with existing methods primarily relying on the distorted wave approximation are discussed to verify accuracy and resolve outstanding issues, particularly with reference to the opacity project (OP). Among the improvements incorporated are: (i) large-scale Breit–Pauli R-matrix calculations for complex atomic systems including fine structure, (ii) convergent close coupling wave function expansions for the (e + ion) system to compute oscillator strengths and photoionization cross sections, (iii) open and closed shell iron ions of interest in astrophysics and experiments, (iv) a treatment for plasma broadening of autoionizing resonances as function of energy-temperature-density dependent cross sections, (v) a ‘top-up’ procedure to compare convergence with R-matrix calculations for highly excited levels, and (vi) spectroscopic identification of resonances and bound (e + ion) levels. The present R-matrix monochromatic opacity spectra are fundamentally different from OP and lead to enhanced Rosseland and Planck mean opacities. An outline of the work reported in other papers in this series and those in progress is presented. Based on the present re-examination of the OP work, opacities of heavy elements might require revisions in high temperature-density plasma sources.
介绍了 R 矩阵方法的扩展版本,用于计算改进等离子体不透明度的辐射参数。讨论了与主要依靠扭曲波近似的现有方法的对比和比较,以验证准确性并解决悬而未决的问题,特别是在不透明度项目(OP)方面。改进之处包括(i) 对包括精细结构在内的复杂原子系统进行大规模布雷特-保利 R 矩阵计算,(ii) 对(e + 离子)系统进行收敛近耦合波函数展开,以计算振子强度和光离子化截面,(iii) 天体物理学和实验中感兴趣的开壳和闭壳铁离子、(iv) 自电离共振的等离子体展宽处理,作为能量-温度-密度相关截面的函数;(v) 一个 "充值 "程序,用于比较高度激发水平与 R 矩阵计算的收敛性;以及 (vi) 共振和束缚(e + 离子)水平的光谱鉴定。目前的 R 矩阵单色不透明性光谱与 OP 有本质区别,并导致罗斯兰和普朗克平均不透明性的增强。本文概述了本系列其他论文中报告的工作以及正在进行的工作。根据目前对 OP 工作的重新审查,重元素的不透明度可能需要对高温密度等离子体源进行修订。
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引用次数: 0
R-matrix calculations for opacities: III. Plasma broadening of autoionizing resonances 不透明的 R 矩阵计算:III.自电离共振的等离子体展宽
IF 1.6 4区 物理与天体物理 Q3 OPTICS Pub Date : 2024-05-16 DOI: 10.1088/1361-6455/ad421d
A K Pradhan
A general formulation is employed to study and quantitatively ascertain the effect of plasma broadening of intrinsic autoionizing (AI) resonances in photoionization cross sections. In particular, R-matrix data for iron ions described in the previous paper in the RMOP series (RMOP-II, hereafter RMOP2) are used to demonstrate underlying physical mechanisms due to electron collisions, ion microfields (Stark), thermal Doppler effects, core excitations, and free–free transitions. Breit–Pauli R-matrix cross sections for a large number of bound levels of Fe ions are considered, 454 levels of Fe XVII, 1184 levels of Fe XVIII and 508 levels of Fe XIX. Following a description of theoretical and computational methods, a sample of results is presented to show significant broadening and shifting of AI resonances due to extrinsic plasma broadening as a function of temperature and density. The redistribution of AI resonance strengths broadly preserves their integrated strengths as well as the naturally intrinsic asymmetric shapes of resonance complexes which are broadened, smeared and flattened, eventually dissolving into the bound-free continua.
采用了一种一般的方法来研究和定量确定等离子体对光离子化截面中固有自电离(AI)共振的拓宽效应。特别是,RMOP 系列的上一篇论文(RMOP-II,以下简称 RMOP2)中描述的铁离子的 R 矩阵数据被用来证明由于电子碰撞、离子微场(斯塔克)、热多普勒效应、核激发和自由跃迁而产生的潜在物理机制。考虑了大量铁离子束缚水平的 Breit-Pauli R 矩阵截面,包括 454 个 Fe XVII 水平、1184 个 Fe XVIII 水平和 508 个 Fe XIX 水平。在对理论和计算方法进行描述之后,我们展示了一个结果样本,它显示了由于等离子体外展宽而导致的 AI 共振的显著展宽和移动,它是温度和密度的函数。人工合成共振强度的重新分布大体上保留了它们的综合强度,以及共振复合物自然固有的不对称形状,这些共振复合物被拓宽、抹平和压扁,最终溶解到无结合的连续体中。
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引用次数: 0
R-matrix calculations for opacities: IV. Convergence, completeness, and comparison of relativistic R-matrix and distorted wave calculations for Fe xvii and Fe xviii 不透明的 R 矩阵计算:IV.铁 xvii 和铁 xviii 的相对论 R 矩阵和扭曲波计算的收敛性、完整性和比较
IF 1.6 4区 物理与天体物理 Q3 OPTICS Pub Date : 2024-05-16 DOI: 10.1088/1361-6455/ad45f6
L Zhao, S N Nahar and A K Pradhan
To investigate the completeness of coupled channel (CC) Breit–Pauli R-matrix (BPRM) calculations for opacities we employ the relativistic distorted wave (RDW) method to complement (‘top-up’) and compare the BPRM photoionization cross sections for high- levels of both Fe xvii and Fe xviii . Good agreement is found with background photoionization cross sections using these two methods, which also ensures the correct matching of bound level cross sections for completeness. In order to top-up the CC-BPRM calculations, bound–bound transitions involving additional bound levels, and a large number of doubly-excited quasi-bound levels corresponding to BPRM autoionizing resonances described in the paper RMOPII are calculated using the RDW method. Photoionization cross sections in the high energy region are also computed and compared up to about 500 Ry, and contributions from higher core level excitations than BPRM are considered. The effect of configuration interaction is investigated, which plays a significant role in correctly reproducing some background cross sections. Due to the fact that the additional RDW levels correspond to high- bound levels that are negligibly populated according to the Mihalas–Hummer–Däppen equation-of-state (paper I), the effect on opacities is expected to be small.
为了研究耦合通道(CC)布赖特-保利 R 矩阵(BPRM)计算的不透明性的完整性,我们采用相对论扭曲波(RDW)方法来补充('top-up')和比较铁 xvii 和铁 xviii 高水平的 BPRM 光电离截面。这两种方法与背景光电离截面的吻合度很高,同时也确保了约束水平截面的正确匹配和完整性。为了充实 CC-BPRM 计算,使用 RDW 方法计算了涉及额外束缚水平的束缚跃迁,以及与论文 RMOPII 中描述的 BPRM 自电离共振相对应的大量双激发准束缚水平。同时还计算了高能区的光电离截面,并对高达约 500 Ry 的光电离截面进行了比较,并考虑了来自比 BPRM 更高的核级激发的贡献。研究了构型相互作用的影响,它在正确再现某些背景截面方面发挥了重要作用。由于额外的 RDW 水平对应于高束缚水平,而根据米哈拉斯-哈默-达本状态方程(论文 I),这些水平的填充可以忽略不计,因此预计对不透明性的影响很小。
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引用次数: 0
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Journal of Physics B: Atomic, Molecular and Optical Physics
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