Positronium Negative Ion Embedded in Non-ideal Classical Plasmas: Doubly Excited Singlet S States

IF 1.7 4区物理与天体物理 Q2 PHYSICS, MULTIDISCIPLINARY Few-Body Systems Pub Date : 2024-04-18 DOI:10.1007/s00601-024-01914-4

Netai Das, Arijit Ghoshal, Yew Kam Ho

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Abstract

The effects of the non-ideality (NI) of the classical plasmas on the doubly excited singlet S states in the positronium negative ion (Ps\(^-\)) are investigated. The organised effect of the plasma is taken care of by means of a pseudopotential which is characterised by the Debye length D and the non-ideality parameter \(\gamma \). Using an extensive wavefunction within the framework of the stabilization method, it has been possible to identify four doubly excited states (DES) in Ps\(^-\). The convergence of the energy and the width of those states are corroborated by increasing the number of terms in the wavefunction. Our present calculation for the plasma-free case reproduces the established results. An inclusive study is made to quantify and qualify the changes experienced by the energies and the widths of those states due to the influence of the NI over a wide range. It is observed that the energy of each DES increases and the width of each DES diminishes due to the effect of the increasing NI of the plasma.

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嵌入非理想经典等离子体的正负电子：双激发单S态

研究了经典等离子体的非理想性（NI）对正电子负离子（Ps\(^-\) ）中双激发单子 S 态的影响。等离子体的有组织效应是通过伪电势来处理的，伪电势由德拜长度 D 和非理想参数 \(\gamma \)表征。在稳定方法的框架内使用广泛的波函数，可以确定 Ps\(^-\) 中的四个双激发态（DES）。通过增加波函数中的项数，这些态的能量和宽度收敛得到了证实。我们目前对无等离子体情况的计算再现了既定结果。我们对这些状态的能量和宽度在很大范围内受 NI 影响而发生的变化进行了量化和定性研究。我们观察到，由于等离子体 NI 的增加，每个 DES 的能量都在增加，每个 DES 的宽度都在减小。

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来源期刊

Few-Body Systems 物理-物理：综合

CiteScore

2.90

自引率

18.80%

发文量

审稿时长

6-12 weeks

期刊介绍： The journal Few-Body Systems presents original research work – experimental, theoretical and computational – investigating the behavior of any classical or quantum system consisting of a small number of well-defined constituent structures. The focus is on the research methods, properties, and results characteristic of few-body systems. Examples of few-body systems range from few-quark states, light nuclear and hadronic systems; few-electron atomic systems and small molecules; and specific systems in condensed matter and surface physics (such as quantum dots and highly correlated trapped systems), up to and including large-scale celestial structures. Systems for which an equivalent one-body description is available or can be designed, and large systems for which specific many-body methods are needed are outside the scope of the journal. The journal is devoted to the publication of all aspects of few-body systems research and applications. While concentrating on few-body systems well-suited to rigorous solutions, the journal also encourages interdisciplinary contributions that foster common approaches and insights, introduce and benchmark the use of novel tools (e.g. machine learning) and develop relevant applications (e.g. few-body aspects in quantum technologies).