Journal of Physics B: Atomic, Molecular and Optical Physics最新文献_第10页

Charge exchange of slow highly charged ions from an electron beam ion trap with surfaces and 2D materials 来自电子束离子阱的慢速高电荷离子与表面和二维材料的电荷交换

IF 1.6 4区物理与天体物理

Journal of Physics B: Atomic, Molecular and Optical Physics Pub Date : 2024-03-18 DOI: 10.1088/1361-6455/ad2e2a

A Niggas, M Werl, F Aumayr, R A Wilhelm

引用次数: 0

Cavity output field nonreciprocal control via interference effects 通过干扰效应实现腔体输出场非互易控制

IF 1.6 4区物理与天体物理

Journal of Physics B: Atomic, Molecular and Optical Physics Pub Date : 2024-03-15 DOI: 10.1088/1361-6455/ad34a1

Yang Zhang, Yu-bo Ma, Hongyi Zhu, Chang-shui Yu

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Interference effects in Compton scattering of keV photons at H+2 : a nonrelativistic analytical approach H+2 处 keV 光子康普顿散射的干涉效应：非相对论分析方法

IF 1.6 4区物理与天体物理

Journal of Physics B: Atomic, Molecular and Optical Physics Pub Date : 2024-03-15 DOI: 10.1088/1361-6455/ad34a3

M. Dieng, H. Bachau

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Application of a metallic-magnetic calorimeter for high-resolution X-ray spectroscopy of Fe at an EBIT 应用金属磁性量热计对 EBIT 中的铁进行高分辨率 X 射线光谱分析

IF 1.6 4区物理与天体物理

Journal of Physics B: Atomic, Molecular and Optical Physics Pub Date : 2024-03-15 DOI: 10.1088/1361-6455/ad34a2

M. O. Herdrich, D. Hengstler, S. Allgeier, Marvin Friedrich, A. Fleischmann, C. Enss, Sonja Bernitt, T. Morgenroth, S. Trotsenko, Reinhold Schuch, Thomas Stöhlker

{"title":"Application of a metallic-magnetic calorimeter for high-resolution X-ray spectroscopy of Fe at an EBIT","authors":"M. O. Herdrich, D. Hengstler, S. Allgeier, Marvin Friedrich, A. Fleischmann, C. Enss, Sonja Bernitt, T. Morgenroth, S. Trotsenko, Reinhold Schuch, Thomas Stöhlker","doi":"10.1088/1361-6455/ad34a2","DOIUrl":"https://doi.org/10.1088/1361-6455/ad34a2","url":null,"abstract":"\u0000 In this work, we present an experiment conducted at the S-EBIT-I ion trap of GSI. It involved the study of ion-electron collisions of Fe and Ba ions in various charge states with the electron beam. Characteristic X-ray radiation emitted during the continuous interaction was recorded utilizing an energy-dispersive maXs-30 detector based on metallic-magnetic calorimeter (MMC) technology. Optimizations to the applied gain-drift correction and energy calibration procedures significantly improved the achieved energy resolution compared to previous applications of a similar detector. This made it possible to individually resolve and identify overlapping X-ray lines of iron and barium in a wide spectral range. As a demonstration of the outstanding detector performance, we used the recorded spectral data to extract an estimate of the charge state distribution of Fe ions in the trap. This experiment campaign marks an important milestone in the ongoing effort to enable the deployment of MMC detectors for future high-precision measurements in fundamental physics experiments.","PeriodicalId":16826,"journal":{"name":"Journal of Physics B: Atomic, Molecular and Optical Physics","volume":null,"pages":null},"PeriodicalIF":1.6,"publicationDate":"2024-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140237474","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Using ‘designer’ coherences to control electron transfer in a model bis(hydrazine) radical cation: can we still distinguish between direct and superexchange mechanisms? 利用 "设计者 "相干性控制双（肼）自由基阳离子模型中的电子转移：我们还能区分直接交换机制和超交换机制吗？

IF 1.6 4区物理与天体物理

Journal of Physics B: Atomic, Molecular and Optical Physics Pub Date : 2024-03-14 DOI: 10.1088/1361-6455/ad2e31

Mercè Deumal, Jordi Ribas-Ariño, Michael A Robb

{"title":"Using ‘designer’ coherences to control electron transfer in a model bis(hydrazine) radical cation: can we still distinguish between direct and superexchange mechanisms?","authors":"Mercè Deumal, Jordi Ribas-Ariño, Michael A Robb","doi":"10.1088/1361-6455/ad2e31","DOIUrl":"https://doi.org/10.1088/1361-6455/ad2e31","url":null,"abstract":"We have simulated two mechanisms, direct and superexchange, for the electron transfer in a <italic toggle=\"yes\">model Bis(hydrazine) Radical Cation</italic>, which consists of two hydrazine moieties coupled by a benzene ring. The computations, that are inspired by the attochemistry approach, focus on the electron dynamics arising from a coherent superposition of four cationic states. The electron dynamics, originating from a solution of the time dependent Schrödinger equation within the Ehrenfest method, is coupled to the relaxation of the nuclei. Both direct (<italic toggle=\"yes\">ca</italic>. 15 fs dynamics) and superexchange (<italic toggle=\"yes\">ca.</italic> 2 fs dynamics) mechanisms are observed and turn out to lie on a continuum depending on the strength of the coupling of the benzene bridge electron dynamics with the hydrazine chromophore dynamics. This contrasts with the chemical pathway approach where the direct mechanism is completely non-adiabatic via a conical intersection, while the superexchange mechanism involves an intermediate radical with the unpaired electron localized on the benzene ring. Thus, with the attochemistry-inspired electron dynamics approach, one can distinguish direct from superexchange mechanisms depending on the strength of the coupling of two types of electron dynamics: the slow hydrazine dynamics (<italic toggle=\"yes\">ca</italic>. 15 fs) and the fast benzene linker dynamics (<italic toggle=\"yes\">ca.</italic> 2 fs). In this model bis(hydrazine) radical cation, only when the intermediate coupler is in an anti-quinoid state, does one see the coupling of the bridge and hydrazine chromophore dynamics.","PeriodicalId":16826,"journal":{"name":"Journal of Physics B: Atomic, Molecular and Optical Physics","volume":null,"pages":null},"PeriodicalIF":1.6,"publicationDate":"2024-03-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140316089","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

On the coupling of three-level quantum refrigerators in the weak coupling limit 论弱耦合极限下的三量子制冷器耦合

IF 1.6 4区物理与天体物理

Journal of Physics B: Atomic, Molecular and Optical Physics Pub Date : 2024-03-14 DOI: 10.1088/1361-6455/ad341d

M.H. Ben Abdou Chakour, A. El Allati, Y. Hassouni

{"title":"On the coupling of three-level quantum refrigerators in the weak coupling limit","authors":"M.H. Ben Abdou Chakour, A. El Allati, Y. Hassouni","doi":"10.1088/1361-6455/ad341d","DOIUrl":"https://doi.org/10.1088/1361-6455/ad341d","url":null,"abstract":"\u0000 We propose a model of two identical autonomous quantum refrigerators that interact through their qubits coupled to cold thermal baths. We consider the same speciﬁc disposition for each refrigerator related to a three-level system coupled to diﬀerent thermal baths and, in turn, to a qubit as the object to be cooled. By coupling the two systems, we show that under certain conditions on the model parameters, the devices can operate in the regime of an independent autonomous quantum refrigerator or be subject to an adjustment of the thermodynamic performances. We further investigate the correlations induced by the interaction between the two refrigerators, and illustrate their behavior with respect to their thermodynamic performances. We have found that adjusting the diﬀerent interaction constants of the model can lead to an evolution of the quantum correlations of the two machines that is inversely related to the behavior of the thermodynamic quantities of both refrigerators. However, this is not necessarily the case when the temperatures of the model are considered as the reference parameters.","PeriodicalId":16826,"journal":{"name":"Journal of Physics B: Atomic, Molecular and Optical Physics","volume":null,"pages":null},"PeriodicalIF":1.6,"publicationDate":"2024-03-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140243804","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Both experimental and molecular dynamics approaches highlight the central role of interfacial water for radical production by irradiated gold nanoparticles 实验和分子动力学方法都强调了界面水在辐照金纳米粒子产生自由基过程中的核心作用

IF 1.6 4区物理与天体物理

Journal of Physics B: Atomic, Molecular and Optical Physics Pub Date : 2024-03-13 DOI: 10.1088/1361-6455/ad2e28

Emilie Brun, Rika Tandiana, Manon Gilles, Yannis Cheref, Nguyen-Thi Van-Oanh, Carine Clavaguera, Cécile Sicard-Roselli

{"title":"Both experimental and molecular dynamics approaches highlight the central role of interfacial water for radical production by irradiated gold nanoparticles","authors":"Emilie Brun, Rika Tandiana, Manon Gilles, Yannis Cheref, Nguyen-Thi Van-Oanh, Carine Clavaguera, Cécile Sicard-Roselli","doi":"10.1088/1361-6455/ad2e28","DOIUrl":"https://doi.org/10.1088/1361-6455/ad2e28","url":null,"abstract":"Nanoparticles devoted to improve radiotherapy treatments are an efficient tool if they can induce the formation of deleterious species in the tumor. Their interaction with radiation is responsible for radical production but in spite of the numerous studies mostly with cells, no consensus has been reached about radical formation mechanism. In order to gain knowledge in the physico-chemical step of this phenomenon, we applied a very sensitive test to quantify hydroxyl radicals and electrons produced when gold atoms, organized as nanoparticles or as a salt in solution, are irradiated by keV and MeV photons (x- and <italic toggle=\"yes\">γ</italic>- rays). The crucial role of interfacial water is suggested to explain the high quantity of radicals measured for nanoparticles. These experimental data were supplemented by classical molecular dynamics simulations, revealing a specific organization of the water hydrogen bonding network at the nanoparticle surface which could be a key component in the mechanism of radical production by irradiated colloidal suspensions.","PeriodicalId":16826,"journal":{"name":"Journal of Physics B: Atomic, Molecular and Optical Physics","volume":null,"pages":null},"PeriodicalIF":1.6,"publicationDate":"2024-03-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140316246","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Production and protection of entanglement via vacuum induced coherences 通过真空诱导相干产生和保护纠缠

IF 1.6 4区物理与天体物理

Journal of Physics B: Atomic, Molecular and Optical Physics Pub Date : 2024-03-13 DOI: 10.1088/1361-6455/ad2d5d

Anjali N Nair, R Arun

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High harmonic generation in monolayer indium nitride 单层氮化铟中的高次谐波生成

IF 1.6 4区物理与天体物理

Journal of Physics B: Atomic, Molecular and Optical Physics Pub Date : 2024-03-12 DOI: 10.1088/1361-6455/ad2e2e

Xiaoyu Liu, Zhiqiang Ji, Chenglong Wu, Shasha Li, Hong Wu, Feng Li, Yong Pu

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Controllable single-photon transport mediated by a time-modulated Jaynes–Cummings model 由时间调制杰尼斯-康明斯模型介导的可控单光子传输

IF 1.6 4区物理与天体物理

Journal of Physics B: Atomic, Molecular and Optical Physics Pub Date : 2024-03-12 DOI: 10.1088/1361-6455/ad2e2b

Haozhen Li, Yang Lan, Ran Zeng, Miao Hu, Mengmeng Xu, Xiuwen Xia, Jingping Xu, Yaping Yang

{"title":"Controllable single-photon transport mediated by a time-modulated Jaynes–Cummings model","authors":"Haozhen Li, Yang Lan, Ran Zeng, Miao Hu, Mengmeng Xu, Xiuwen Xia, Jingping Xu, Yaping Yang","doi":"10.1088/1361-6455/ad2e2b","DOIUrl":"https://doi.org/10.1088/1361-6455/ad2e2b","url":null,"abstract":"Controllable single-photon scattering in a one-dimensional waveguide coupled to a Jaynes–Cummings structure containing a time-modulated two-level atom interacting with a single-mode cavity is investigated. The photon transmission and reflection amplitudes are calculated by using an effective Floquet Hamiltonian in real space. The results show that the coupling between the atom and the cavity mode can dynamically be tuned via periodically modulating the atomic transition frequency. As a consequence, the scattering behaviors of the waveguide photons can be actively manipulated, and a controllable single-photon switch with high on-off ratio could be realized. More interestingly, the switch works well within a wide frequency region, i.e., the transmission of both resonant and off-resonant waveguide photons can be effectively switched on or off with appropriate system parameters. Furthermore, the proposed dynamically tunable switching scheme is robust against atomic dissipation associated with the help of atom-cavity coupling mismatch. Such single-photon device can be used as an elementary unit for various quantum information processing.","PeriodicalId":16826,"journal":{"name":"Journal of Physics B: Atomic, Molecular and Optical Physics","volume":null,"pages":null},"PeriodicalIF":1.6,"publicationDate":"2024-03-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140316090","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0