Physics Open最新文献_第9页

Calculations of energy levels, radiative transition parameters, hyperfine structure constants AJ - BJ, Landé gJ factors and isotope shifts for Sc XX using the MCDF-RCI method 用MCDF-RCI方法计算Sc XX的能级、辐射跃迁参数、超精细结构常数AJ - BJ、land<s:1> gJ因子和同位素位移

Physics Open Pub Date : 2023-07-01 DOI: 10.1016/j.physo.2023.100160

Shikha Rathi, Lalita Sharma

{"title":"Calculations of energy levels, radiative transition parameters, hyperfine structure constants AJ - BJ, Landé gJ factors and isotope shifts for Sc XX using the MCDF-RCI method","authors":"Shikha Rathi, Lalita Sharma","doi":"10.1016/j.physo.2023.100160","DOIUrl":"https://doi.org/10.1016/j.physo.2023.100160","url":null,"abstract":"<div>Large scale calculations for the energy levels, transition rates, oscillator strengths, lifetimes, hyperfine interaction constants, Landé <math><msub><mrow><mi>g</mi></mrow><mrow><mi>J</mi></mrow></msub></math> factors, and isotope shift factors have been performed for <math><mrow><mn>1</mn><msup><mrow><mi>s</mi></mrow><mrow><mn>2</mn></mrow></msup></mrow></math> and <math><mrow><mn>1</mn><mi>s</mi><mi>n</mi><mi>l</mi></mrow></math> <math><mrow><mo>(</mo><mi>n</mi><mo>=</mo><mn>2</mn><mo>−</mo><mn>8</mn><mspace></mspace><mi>and</mi><mspace></mspace><mi>l</mi><mo>≤</mo><mi>n</mi><mo>−</mo><mn>1</mn><mo>)</mo></mrow></math> levels of He-like Sc XX ion. The general-purpose relativistic atomic structure package (GRASP2018) based on the fully relativistic multiconfiguration Dirac–Fock (MCDF) method is used to carry out the calculations. The leading quantum electrodynamic corrections, Breit interaction and nuclear recoil effects are also included in the succeeding relativistic configuration interaction (RCI) calculations. The relativistic isotope shift (RIS4) programme is used to determine the mass and field shifts factors. Furthermore, the percentage uncertainty in the transition parameters and lifetimes is estimated. A detailed comparison of the present results with the corresponding values from the NIST database and other theoretical and experimental works, wherever available, has been done, and an excellent agreement is achieved. A large section of the results is reported for the first time in the present work.</div>","PeriodicalId":36067,"journal":{"name":"Physics Open","volume":"16 ","pages":"Article 100160"},"PeriodicalIF":0.0,"publicationDate":"2023-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49759541","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Free space continuous variable Quantum Key Distribution with discrete phases 具有离散相位的自由空间连续变量量子密钥分布

Physics Open Pub Date : 2023-07-01 DOI: 10.1016/j.physo.2023.100162

Anju Rani , Pooja Chandravanshi , Jayanth Ramakrishnan , Pravin Vaity , P. Madhusudhan , Tanya Sharma , Pranav Bhardwaj , Ayan Biswas , R.P. Singh

引用次数: 0

Accurate derivation of THG conversion efficiency in periodically poled nonlinear medium and optimizing conversion parameters 周期极化非线性介质中THG转换效率的精确推导及转换参数的优化

Physics Open Pub Date : 2023-07-01 DOI: 10.1016/j.physo.2023.100158

Muhammad Abdul Rahman, Nour Nasser, Moustafa Sayem El-Daher

{"title":"Accurate derivation of THG conversion efficiency in periodically poled nonlinear medium and optimizing conversion parameters","authors":"Muhammad Abdul Rahman, Nour Nasser, Moustafa Sayem El-Daher","doi":"10.1016/j.physo.2023.100158","DOIUrl":"10.1016/j.physo.2023.100158","url":null,"abstract":"<div>We have derived a novel equation to accurately predict the third harmonic generation (THG) conversion efficiency in hybrid periodically poled nonlinear medium. Our equation considers the general case that takes both depleted pump regime and phase mismatching cases, resulting in more precise predictions of efficiency. This level of accuracy is crucial for certain applications like high-power THG lasers. Moreover, accurate calculation of THG power density is essential to prevent exceeding the crystal damage threshold. We applied our equation on hybrid MgO:PPLN crystal to determine the optimal SHG region length corresponding to two different power densities, namely, <math><mrow><mn>0.25</mn></mrow></math> and <math><mrow><mn>0.5</mn><mrow><mrow><mi>M</mi><mi>W</mi></mrow><mo>/</mo><mrow><mi>c</mi><msup><mi>m</mi><mn>2</mn></msup></mrow></mrow></mrow></math>. The effect of crystal temperature on efficiency was also studies. Furthermore, a comparison between the derived equation and the commonly used nondepleted pump regime equation was performed. We found that the latter equation is significantly less accurate, particularly at high power densities, with the efficiency of the depleted pump regime being 50.6% less than nondepleted one. To demonstrate the effectiveness of the equation, our results were compared with experimental data, and we observed a good agreement between them.</div>","PeriodicalId":36067,"journal":{"name":"Physics Open","volume":"16 ","pages":"Article 100158"},"PeriodicalIF":0.0,"publicationDate":"2023-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46223080","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Gravitational lensing and missing mass 引力透镜效应和质量缺失

Physics Open Pub Date : 2023-05-01 DOI: 10.1016/j.physo.2023.100150

Saurya Das , Sourav Sur

引用次数: 0

General pseudo self-adjoint boundary conditions for a 1D KFG particle in a box 框内一维KFG粒子的一般伪自伴随边界条件

Physics Open Pub Date : 2023-05-01 DOI: 10.1016/j.physo.2023.100151

Salvatore De Vincenzo

{"title":"General pseudo self-adjoint boundary conditions for a 1D KFG particle in a box","authors":"Salvatore De Vincenzo","doi":"10.1016/j.physo.2023.100151","DOIUrl":"10.1016/j.physo.2023.100151","url":null,"abstract":"<div>We consider a 1D Klein–Fock–Gordon particle in a finite interval, or box. We construct for the first time the most general set of pseudo self-adjoint boundary conditions for the Hamiltonian operator that is present in the first order in time 1D Klein–Fock–Gordon wave equation, or the 1D Feshbach–Villars wave equation. We show that this set depends on four real parameters and can be written in terms of the one-component wavefunction for the second order in time 1D Klein–Fock–Gordon wave equation and its spatial derivative, both evaluated at the endpoints of the box. Certainly, we write the general set of pseudo self-adjoint boundary conditions also in terms of the two-component wavefunction for the 1D Feshbach–Villars wave equation and its spatial derivative, evaluated at the ends of the box; however, the set actually depends on these two column vectors each multiplied by the singular matrix that is present in the kinetic energy term of the Hamiltonian. As a consequence, we found that the two-component wavefunction for the 1D Feshbach–Villars equation and its spatial derivative do not necessarily satisfy the same boundary condition that these quantities satisfy when multiplied by the singular matrix. In any case, given a particular boundary condition for the one-component wavefunction of the standard 1D Klein–Fock–Gordon equation and using the pair of relations that arise from the very definition of the two-component wavefunction for the 1D Feshbach–Villars equation, the respective boundary condition for the latter wavefunction and its derivative can be obtained. Our results can be extended to the problem of a 1D Klein–Fock–Gordon particle moving on a real line with a point interaction (or a hole) at one point.</div>","PeriodicalId":36067,"journal":{"name":"Physics Open","volume":"15 ","pages":"Article 100151"},"PeriodicalIF":0.0,"publicationDate":"2023-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47138149","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Using optical systems to simulate topological systems in momentum space and measure their topological numbers 利用光学系统模拟动量空间中的拓扑系统并测量其拓扑数

Physics Open Pub Date : 2023-05-01 DOI: 10.1016/j.physo.2023.100145

Zhongcheng Feng, Jiansheng Wu

引用次数: 0

Relativistic energies and information entropy of the inversely quadratic Hellmann potential 逆二次赫尔曼势的相对论能量和信息熵

Physics Open Pub Date : 2023-05-01 DOI: 10.1016/j.physo.2023.100152

I.J. Njoku, C.P. Onyenegecha, C.J. Okereke, P. Nwaokafor, C.C. Abara

引用次数: 0

Electromagnetic angular momentum in anisotropic media and Beth's torque 各向异性介质中的电磁角动量与贝思力矩

Physics Open Pub Date : 2023-05-01 DOI: 10.1016/j.physo.2023.100147

J.A.E. Roa-Neri , J.L. Jiménez , I. Campos

{"title":"Electromagnetic angular momentum in anisotropic media and Beth's torque","authors":"J.A.E. Roa-Neri , J.L. Jiménez , I. Campos","doi":"10.1016/j.physo.2023.100147","DOIUrl":"https://doi.org/10.1016/j.physo.2023.100147","url":null,"abstract":"<div>The interaction of radiation with material media is a very active area of research, in particular the interaction with new exotic materials. However, we find several controversies in this field, like the Abraham-Minkowski controversy, or the attribution of angular momentum to quasi-static fields.In the present work we show that besides the electromagnetic momentum density proportional to Poynting's vector, whose time derivative is force and therefore can produce a torque, there are other momentum densities implied by the macroscopic Maxwell equations transformed into momentum balance equations. These momentum densities are also related to forces and torques. We show in this way that torques like D × E and B × H appear in these balance equations transformed into balance equations of angular momentum. The density D × E was used by Beth [Phys. Rev. 50 115–125 (1936)] to measure the angular momentum of radiation fields in interaction with anisotropic dielectrics. Our analysis show that also static or quasi-static fields carry angular momentum and produce torques when interacting with anisotropic materials.</div>","PeriodicalId":36067,"journal":{"name":"Physics Open","volume":"15 ","pages":"Article 100147"},"PeriodicalIF":0.0,"publicationDate":"2023-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49766498","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Dynamics of quantum coherence in the Jaynes–Cummings model with quenched disorder 具有猝灭无序的Jaynes-Cummings模型中的量子相干动力学

Physics Open Pub Date : 2023-05-01 DOI: 10.1016/j.physo.2023.100146

Jesus H. Warnes , Fagner M. de Paula , Natanael C. Costa , Olimpio P. de Sá Neto

引用次数: 0

Unveiling the Markovian to non-Markovian transition with quantum collision models 用量子碰撞模型揭示马尔可夫到非马尔可夫跃迁

Physics Open Pub Date : 2023-05-01 DOI: 10.1016/j.physo.2023.100144

Willames F. Magalhães, Carlos O.A. Ribeiro Neto, Bertúlio de Lima Bernardo

引用次数: 1