Atoms Pub Date : 2023-10-08 DOI: 10.3390/atoms11100128

Ibtissem Hannachi, Roland Stamm

{"title":"The Fingerprints of Periodic Electric Fields on Line Shapes Emitted in Plasmas","authors":"Ibtissem Hannachi, Roland Stamm","doi":"10.3390/atoms11100128","DOIUrl":"https://doi.org/10.3390/atoms11100128","url":null,"abstract":"Periodic electric fields are found in many kinds of plasmas and result from the presence of collective fields amplified by plasma instabilities, or they are created by external sources such as microwave generators or lasers. The spectral lines emitted by atoms or ions in a plasma exhibit a frequency profile characteristic of plasma conditions, such as the temperature and density of charged particles. The fingerprints of periodic electric fields appear clearly on the line shape for a large range of frequencies and magnitudes of the oscillating electric field. Satellite structures appear near to multiples of the oscillation frequency and redistribute the intensity of the line far from the line center. The modeling of the simultaneous effects of the plasma microfield and of a periodic electric field has been active since the seventies, but it remains difficult to be conducted accurately since the quantum emitter is submitted to several time-dependent electric fields, each with their own characteristic time. We describe here a numerical approach which couples a simulation of the motion of charged plasma particles with an integration of the emitter Schrödinger equation. Resulting hydrogen line shapes are presented for different plasmas and periodic fields encountered in laboratory and astrophysical plasmas.","PeriodicalId":8629,"journal":{"name":"Atoms","volume":"44 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135251025","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

Status of CHIP-TRAP: The Central Michigan University High-Precision Penning Trap CHIP-TRAP的现状:中密歇根大学高精度Penning Trap

Atoms Pub Date : 2023-10-07 DOI: 10.3390/atoms11100127

Nadeesha Gamage, Madhawa Horana, Rachel Sandler, Ramesh Bhandari, Matthew Redshaw

{"title":"Status of CHIP-TRAP: The Central Michigan University High-Precision Penning Trap","authors":"Nadeesha Gamage, Madhawa Horana, Rachel Sandler, Ramesh Bhandari, Matthew Redshaw","doi":"10.3390/atoms11100127","DOIUrl":"https://doi.org/10.3390/atoms11100127","url":null,"abstract":"Precise and accurate atomic mass data provide crucial information for applications in a wide range of fields in physics and beyond, including astrophysics, nuclear structure, particle and neutrino physics, fundamental symmetries, chemistry, and metrology. The most precise atomic mass measurements are performed on charged particles confined in a Penning trap. Here, we describe the development, status, and outlook of CHIP-TRAP: the Central Michigan University high-precision Penning trap. CHIP-TRAP aims to perform ultra-high precision (∼1 part in 1011 fractional precision) mass measurements on stable and long-lived isotopes produced with external ion sources and transported to the Penning traps. Along the way, ions of a particular m/q are selected with a multi-reflection time-of-flight mass separator (MR-TOF-MS), with further filtering performed in a cylindrical capture trap before the ions are transported to a pair of hyperbolic measurement traps. In this paper, we report on the design and status of CHIP-TRAP and present results from the commissioning of the ion sources, MR-TOF-MS, and capture trap. We also provide an outlook on the continued development and commissioning of CHIP-TRAP.","PeriodicalId":8629,"journal":{"name":"Atoms","volume":"215 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135252052","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

Single Ionization of Helium by Protons of Various Energies in the Parabolic Quasi-Sturmians Approach 不同能量的质子在抛物线准图尔米斯方法中的氦的单电离

Atoms Pub Date : 2023-09-28 DOI: 10.3390/atoms11100124

Alexander S. Zaytsev, Darya S. Zaytseva, Sergey A. Zaytsev, Lorenzo U. Ancarani, Ochbadrakh Chuluunbaatar, Konstantin A. Kouzakov, Yury V. Popov

{"title":"Single Ionization of Helium by Protons of Various Energies in the Parabolic Quasi-Sturmians Approach","authors":"Alexander S. Zaytsev, Darya S. Zaytseva, Sergey A. Zaytsev, Lorenzo U. Ancarani, Ochbadrakh Chuluunbaatar, Konstantin A. Kouzakov, Yury V. Popov","doi":"10.3390/atoms11100124","DOIUrl":"https://doi.org/10.3390/atoms11100124","url":null,"abstract":"The parabolic quasi-Sturmian approach, recently introduced for the calculation of ion–atom ionizing collisions, is adapted and applied here to the single ionization of helium induced by an intermediate-energy proton impact. Within the method, the ionization amplitude is represented as the sum of the products of the basis amplitudes associated with the asymptotic behavior of the continuum states of the two noninteracting hydrogenic subsystems (e−,He+) and (p+,He+). The p−e interaction is treated as a perturbation in the Lippmann–Schwinger-type (LS) equation for the three-body system (e−,He+,p+). This LS equation is solved numerically using separable expansions for the proton–electron potential. We examine the convergence behavior of the transition amplitude expansion as the number of terms in the representation of the p−e interaction is increased and find that, for some kinematic regimes, the convergence is poor. This difficulty, which is absent for a higher proton energy impact, is solved by varying the momentum of the auxiliary proton plane wave introduced into the basis function. Fully differential cross-sections are calculated and compared with experimental data for 75 keV protons and the results obtained with the 3C model.","PeriodicalId":8629,"journal":{"name":"Atoms","volume":"49 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135344143","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

Quadrupole Effects in the Photoionisation of Sodium 3s in the Vicinity of the Dipole Cooper Minimum 偶极子库伯极小值附近钠3s光离的四极效应

Atoms Pub Date : 2023-09-28 DOI: 10.3390/atoms11100125

Nishita M. Hosea, Jobin Jose, Hari R. Varma, Pranawa C. Deshmukh, Steven T. Manson

引用次数: 0

Applications of Machine Learning and Neural Networks for FT-ICR Mass Measurements with SIPT 机器学习和神经网络在SIPT FT-ICR质量测量中的应用

Atoms Pub Date : 2023-09-28 DOI: 10.3390/atoms11100126

Scott E. Campbell, Georg Bollen, Alec Hamaker, Walter Kretzer, Ryan Ringle, Stefan Schwarz

{"title":"Applications of Machine Learning and Neural Networks for FT-ICR Mass Measurements with SIPT","authors":"Scott E. Campbell, Georg Bollen, Alec Hamaker, Walter Kretzer, Ryan Ringle, Stefan Schwarz","doi":"10.3390/atoms11100126","DOIUrl":"https://doi.org/10.3390/atoms11100126","url":null,"abstract":"The single-ion Penning trap (SIPT) at the Low-Energy Beam Ion Trapping Facility has been developed to perform precision Penning trap mass measurements of single ions, ideal for the study of exotic nuclei available only at low rates at the Facility for Rare Isotope Beams (FRIB). Single-ion signals are very weak—especially if the ion is singly charged—and the few meaningful ion signals must be disentangled from an often larger noise background. A useful approach for simulating Fourier transform ion cyclotron resonance signals is outlined and shown to be equivalent to the established yet computationally intense method. Applications of supervised machine learning algorithms for classifying background signals are discussed, and their accuracies are shown to be ≈65% for the weakest signals of interest to SIPT. Additionally, a deep neural network capable of accurately predicting important characteristics of the ions observed by their image charge signal is discussed. Signal classification on an experimental noise dataset was shown to have a false-positive classification rate of 10.5%, and 3.5% following additional filtering. The application of the deep neural network to an experimental 85Rb+ dataset is presented, suggesting that SIPT is sensitive to single-ion signals. Lastly, the implications for future experiments are discussed.","PeriodicalId":8629,"journal":{"name":"Atoms","volume":"70 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135388813","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

The Double-Nozzle Technique Equipped with RF-Only Funnel and RF-Buncher for the Ion Beam Extraction into Vacuum 配备rf漏斗和rf聚束器的双喷嘴技术用于离子束真空抽提

Atoms Pub Date : 2023-09-22 DOI: 10.3390/atoms11100123

Victor Varentsov

引用次数: 0

Stark Broadening of Lyman-α in the Presence of a Strong Magnetic Field 强磁场作用下Lyman-α的Stark展宽

Atoms Pub Date : 2023-09-15 DOI: 10.3390/atoms11090120

Evgeny Stambulchik

引用次数: 0

Electronic Structure, Spectroscopy, Cold Ion–Atom Elastic Collision Properties, and Photoassociation Formation Prediction of the (MgCs)+ Molecular Ion (MgCs)+分子离子的电子结构、光谱学、冷离子-原子弹性碰撞特性和光缔合形成预测

Atoms Pub Date : 2023-09-15 DOI: 10.3390/atoms11090121

Mohamed Farjallah, Dibyendu Sardar, Bimalendu Deb, Hamid Berriche

{"title":"Electronic Structure, Spectroscopy, Cold Ion–Atom Elastic Collision Properties, and Photoassociation Formation Prediction of the (MgCs)+ Molecular Ion","authors":"Mohamed Farjallah, Dibyendu Sardar, Bimalendu Deb, Hamid Berriche","doi":"10.3390/atoms11090121","DOIUrl":"https://doi.org/10.3390/atoms11090121","url":null,"abstract":"In this paper, we extensively study the electronic structure, interactions, and dynamics of the (MgCs)+ molecular ion. The exchanges between the alkaline atom and the low-energy cationic alkaline earths, which are important in the field of cold and ultracold quantum chemistry, are studied. We use an ab initio approach based on the formalism of non-empirical pseudo-potential for Mg2+ and Cs+ cores, large Gaussian basis sets, and full-valence configuration interaction. In this context, the (MgCs)+ cation is treated as an effective two-electron system. Adiabatic potential energy curves and their spectroscopic constants for the ground and the first 20 excited states of 1,3Σ+ symmetries are determined. Furthermore, we identify the avoided crossings between the electronic states of 1,3Σ+ symmetries. These crossings are related to the charge transfer process between the two ionic limits, Mg/Cs+ and Mg+/Cs. Therefore, vibrational-level spacings and the transition and permanent dipole moments are presented and analyzed. Using the produced potential energy data, the ground-state scattering wave functions and elastic cross-sections are calculated for a wide range of energies. In addition, we predict the formation of a translationally and rotationally cold molecular ion (MgCs)+ in the ground-state electronic potential energy through a stimulated Raman-type process aided by ion–atom cold collision. In the low-energy limit (<1 mK), elastic scattering cross-sections exhibit Wigner law threshold behavior, while in the high-energy limit, the cross-sections act as a function of energy E go as E−1/3. A qualitative discussion about the possibilities of forming cold (MgCs)+ molecular ions by photoassociative spectroscopy is presented.","PeriodicalId":8629,"journal":{"name":"Atoms","volume":"35 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135438435","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

Ionization of Hydrogen Atom by Proton Impact—How Accurate Is the Ionization Cross Section? 质子撞击使氢原子电离——电离截面有多精确?

Atoms Pub Date : 2023-09-15 DOI: 10.3390/atoms11090122

Károly Tőkési, Saleh Alassaf

引用次数: 0

g Factor of Few-Electron Highly Charged Ions 少电子高电荷离子的g因子

Atoms Pub Date : 2023-09-08 DOI: 10.3390/atoms11090119

Dmitry A. Glazov, Dmitrii V. Zinenko, Valentin A. Agababaev, Artyom D. Moshkin, Elizaveta V. Tryapitsyna, Anna M. Volchkova, Andrey V. Volotka

引用次数: 0

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