Journal of Physics B: Atomic, Molecular and Optical Physics最新文献_第8页

Vortex beam induced spatial modulation of quantum-optical eﬀects in a coherent atomic medium 相干原子介质中涡旋光束诱导的量子光学效应空间调制

IF 1.6 4区物理与天体物理

Journal of Physics B: Atomic, Molecular and Optical Physics Pub Date : 2024-04-15 DOI: 10.1088/1361-6455/ad3ed1

P. Panchadhyayee, Aniket Banerjee, B. Dutta

{"title":"Vortex beam induced spatial modulation of quantum-optical eﬀects in a coherent atomic medium","authors":"P. Panchadhyayee, Aniket Banerjee, B. Dutta","doi":"10.1088/1361-6455/ad3ed1","DOIUrl":"https://doi.org/10.1088/1361-6455/ad3ed1","url":null,"abstract":"\u0000 We have studied two-dimensional (2D) absorption, gain, and corresponding refractive index profiles in a ladder-type three-level atomic system interacting with three coherent fields. One is a weak probe field considered as a plane wave, while the other two are the control fields taken as two Laguerre-Gaussian (LG) doughnut beams. Position dependence of two vortex beams induces the spatially modulated coherence at the condition of resonance, which enables us to obtain space-dependent absorption, transparency, gain without inversion (GWI), and refractive index enhancement in the present scheme. The azimuthal modulation of coherence effects is attributed to the presence of optical angular momentum (OAM) of the vortex beams. Under the influence of an additional travelling wave field with the presence of two vortex beams, the present model leads us to obtain an ultra-large enhancement of refractive index at the resonant detuning of the fields. This phenomenon makes the atom-field system to play the equivalent role of a high-refractive-index prism. The role of near dipole-dipole (NDD) interaction on the modulation of position-dependent coherence effects has also been investigated. It has been shown that, without any inclusion of the travelling wave field in the system, the phenomenon of resonant enhancement of refractive index may also occur in the presence of NDD effect. The new way of generating spatially controlled GWI and nonlinear refractive index enhancement is specific to the present model. This work seems to be useful for finding its applications in spatially modulated coherence controlled electromagnetically induced transparency (EIT)-based quantum devices like quantum optical memory, switches, and quantum logic gates, where the refractive index switching phenomenon is a prerequisite.","PeriodicalId":16826,"journal":{"name":"Journal of Physics B: Atomic, Molecular and Optical Physics","volume":null,"pages":null},"PeriodicalIF":1.6,"publicationDate":"2024-04-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140699533","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

Faster than a speeding bullet—the 2023 Physics Nobel Prize 比子弹还快--2023 年诺贝尔物理学奖

IF 1.6 4区物理与天体物理

Journal of Physics B: Atomic, Molecular and Optical Physics Pub Date : 2024-04-11 DOI: 10.1088/1361-6455/ad3600

Marc Vrakking

引用次数: 0

Fragmentation and charge transfer in cyclic dipeptides with an aromatic side chain induced by VUV radiation 紫外线辐射诱导带有芳香族侧链的环状二肽的碎裂和电荷转移

IF 1.6 4区物理与天体物理

Journal of Physics B: Atomic, Molecular and Optical Physics Pub Date : 2024-04-08 DOI: 10.1088/1361-6455/ad3c00

L. Carlini, A. Casavola, J. Chiarinelli, Francesco Porcelli, Elena Molteni, Giuseppe Mattioli, P. Bolognesi, Davide Sangalli, F. Vismarra, Ying-Huei Wu, Rocı́o Borrego Varillas, M. Nisoli, Manjot Singh, M. Valadan, Carlo Altucci, R. Richter, L. Avaldi

{"title":"Fragmentation and charge transfer in cyclic dipeptides with an aromatic side chain induced by VUV radiation","authors":"L. Carlini, A. Casavola, J. Chiarinelli, Francesco Porcelli, Elena Molteni, Giuseppe Mattioli, P. Bolognesi, Davide Sangalli, F. Vismarra, Ying-Huei Wu, Rocı́o Borrego Varillas, M. Nisoli, Manjot Singh, M. Valadan, Carlo Altucci, R. Richter, L. Avaldi","doi":"10.1088/1361-6455/ad3c00","DOIUrl":"https://doi.org/10.1088/1361-6455/ad3c00","url":null,"abstract":"\u0000 The fragmentation of three cyclic dipeptides (c-Glycil-Phenylalanine, c-Tryptophan-Tyrosine and c-Tryptophan-Tryptophan), characterized by an aromatic side chain, has been investigated by synchrotron radiation and photoelectron-photoion coincidence (PEPICO) experiments, assisted by atomistic simulations. The PEPICO experiments show that the charged moiety containing the aromatic side chain is the main fragment in the three samples. The theoretical exploration of the potential energy surfaces has allowed to identify the possible fragmentation paths leading to the formation of these fragments. Then, the analysis of the differences in the electronic density distributions of the neutral molecule and the cation and a molecular dynamics simulation provided an understanding of the preferred localization of the positive charge on the aromatic side chain of the cyclic dipeptide.","PeriodicalId":16826,"journal":{"name":"Journal of Physics B: Atomic, Molecular and Optical Physics","volume":null,"pages":null},"PeriodicalIF":1.6,"publicationDate":"2024-04-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140729983","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

Spectroscopy of the 5s5p 3P0 → 5s5d 3D1 transition of strontium using laser cooled atoms 利用激光冷却原子对锶的 5s5p 3P0 → 5s5d 3D1 转变进行光谱分析

IF 1.6 4区物理与天体物理

Journal of Physics B: Atomic, Molecular and Optical Physics Pub Date : 2024-04-08 DOI: 10.1088/1361-6455/ad3bff

Kushal Patel, Palki Gakkhar, K. Biswas, S. Maurya, Pranab Dutta, Vishal Lal, B. Mani, U. Rapol

{"title":"Spectroscopy of the 5s5p 3P0 → 5s5d 3D1 transition of strontium using laser cooled atoms","authors":"Kushal Patel, Palki Gakkhar, K. Biswas, S. Maurya, Pranab Dutta, Vishal Lal, B. Mani, U. Rapol","doi":"10.1088/1361-6455/ad3bff","DOIUrl":"https://doi.org/10.1088/1361-6455/ad3bff","url":null,"abstract":"\u0000 This article presents spectroscopy results of the 5s5p 3P0 → 5s5d 3D1 transition in all isotopes of laser cooled Sr atoms and the utility of this transition for repumping application. By employing the 5s5p 3P0 → 5s5d 3D1 (483 nm) transition in combination with the excitation of 5s5p 3P2 → 5s6s 3S1 (707 nm) transition, we observe a significant increase (∼ 13 fold) in the steady state number of atoms in the magneto-optic trap (MOT). This enhancement is attributed to the efficient repumping of Sr atoms that have decayed into the dark 5s5p 3P2 state by returning them to the ground state 5s2\u0000 1S0 without any loss into the other states. The absolute transition frequencies were measured with an absolute accuracy of 30 MHz. To support our measurements, we performed Fock-space relativistic coupled-cluster calculations of the relevant parameters in Sr. To further increase the accuracy of the calculated properties, corrections from the Breit, QED and perturbative triples were also included. The calculated branching ratio for the repumping state confirms the significantly increased population in the 3P1 state. Thereby, leading to an increase of population of atoms trapped due to the enhanced repumping. Our calculated hyperfine-splitting energies are in excellent agreement with the measured values. Moreover, our calculated isotope shifts in the transition frequencies are in good agreement with our measured values.","PeriodicalId":16826,"journal":{"name":"Journal of Physics B: Atomic, Molecular and Optical Physics","volume":null,"pages":null},"PeriodicalIF":1.6,"publicationDate":"2024-04-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140731420","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

Semi-empirical cross-section formulas for electron-impact ionization and rate coefficient calculations 电子撞击电离和速率系数计算的半经验截面公式

IF 1.6 4区物理与天体物理

Journal of Physics B: Atomic, Molecular and Optical Physics Pub Date : 2024-04-07 DOI: 10.1088/1361-6455/ad4242

D. Benredjem, J. Pain

引用次数: 0

Interplay of intermolecular and intramolecular vibrations mediates ultrafast singlet fission 分子间振动和分子内振动的相互作用促成了超快单子裂变

IF 1.6 4区物理与天体物理

Journal of Physics B: Atomic, Molecular and Optical Physics Pub Date : 2024-04-05 DOI: 10.1088/1361-6455/ad3b53

Binjie Cui, Ajay Jha, H. Duan

{"title":"Interplay of intermolecular and intramolecular vibrations mediates ultrafast singlet fission","authors":"Binjie Cui, Ajay Jha, H. Duan","doi":"10.1088/1361-6455/ad3b53","DOIUrl":"https://doi.org/10.1088/1361-6455/ad3b53","url":null,"abstract":"\u0000 Singlet fission (SF) is an exciton multiplication process that splits a singlet exciton in organic semiconductors into two triplet excitons and thus, can overcome the Shockley-Queisser limit to improve the solar energy conversion efficiency in photovoltaics. In this paper, we construct a unified model for the ultrafast primary step of the SF process. To achieve that we investigate the dynamics of vibrational modes and their interactions to the relevant electronic excited states in prototypical SF materials, pentacene (exothermic SF) and tetracene (endothermic SF) single crystals. Additionally, the functional role of charge transfer (CT) state is also examined. Using the refined parameters obtained from the reported experimental results, we deduce that the intermolecular vibrations mediate the SF in pentacene with the assistance from strong vibronic couplings to intramolecular modes, which drives the SF process to occur within 100 fs. In this timescale, the CT state has a limiting role towards the SF process in pentacene. However, the CT state plays an important role in a relatively slower SF process of tetracene. Our results disentangle the role of underlying vibrational coherences and clarify the importance of the CT state in tetracene crystal. Hence, with our unified model, we can study the coherent dynamics of SF process, which can principally be extended to the other SF materials as well.","PeriodicalId":16826,"journal":{"name":"Journal of Physics B: Atomic, Molecular and Optical Physics","volume":null,"pages":null},"PeriodicalIF":1.6,"publicationDate":"2024-04-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140738529","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

Excitation and recombination studies with silicon and sulphur ions at an EBIT 硅和硫离子在 EBIT 条件下的激发和重组研究

IF 1.6 4区物理与天体物理

Journal of Physics B: Atomic, Molecular and Optical Physics Pub Date : 2024-04-02 DOI: 10.1088/1361-6455/ad31ad

I Orban, S Mahmood, T Fritjof, E Lindroth, C Z Dong, J l Rui, L Y Xie, R Schuch

{"title":"Excitation and recombination studies with silicon and sulphur ions at an EBIT","authors":"I Orban, S Mahmood, T Fritjof, E Lindroth, C Z Dong, J l Rui, L Y Xie, R Schuch","doi":"10.1088/1361-6455/ad31ad","DOIUrl":"https://doi.org/10.1088/1361-6455/ad31ad","url":null,"abstract":"Measurements of electron-impact excitation and recombination rate coefficients of highly charged Si and S ions at the Stockholm electron beam ion trap are reported. The experimental method was a combination of photon detection from the trapped ions during probing and subsequently extraction and time-of-flight (TOF) charge analysis of these ions. The TOF technique allows to measure recombination rate coefficients separately for every charge state, and together with the photon spectra of these ions also the excitation rate coefficients. In this paper, we present more details of the experimental procedure and summarize the experimental results in comparison with two different state-of-the-art calculations of recombination and excitation rates for Si10+–Si13+ and S12+–S15+ ions. One of these uses a relativistic configuration interaction approach (flexible atomic code) and the other is a relativistic many-body perturbation theory. A good to excellent agreement with both of them is found in energy and resonance strength for the investigated ions.","PeriodicalId":16826,"journal":{"name":"Journal of Physics B: Atomic, Molecular and Optical Physics","volume":null,"pages":null},"PeriodicalIF":1.6,"publicationDate":"2024-04-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140572091","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

Laser-assisted (e,2e) study with twisted electron beam on H-atom 利用扭曲电子束对 H 原子进行激光辅助（e,2e）研究

IF 1.6 4区物理与天体物理

Journal of Physics B: Atomic, Molecular and Optical Physics Pub Date : 2024-03-28 DOI: 10.1088/1361-6455/ad38f0

Neha Tewatia, N. Dhankhar, Raul Sheldon Pinto, R. Choubisa

{"title":"Laser-assisted (e,2e) study with twisted electron beam on H-atom","authors":"Neha Tewatia, N. Dhankhar, Raul Sheldon Pinto, R. Choubisa","doi":"10.1088/1361-6455/ad38f0","DOIUrl":"https://doi.org/10.1088/1361-6455/ad38f0","url":null,"abstract":"\u0000 We study the laser-assisted twisted electron beam impact ionization of the hydrogen atom in coplanar asymmetric geometry. We develop the theoretical model in the first Born approximation. In the presence of the laser field, we treat the incident and scattered electrons as Volkov waves; the ejected electron, moving in the combined field of the laser and residual ion H+, as a Coulomb- Volkov wave function. In this communication, we compare the angular profile of triple differential cross-section (TDCS) for laser-assisted twisted electron beam incidence with the plane-wave, laser-assisted plane wave, and field-free twisted electron beam for (e,2e) processes for different orbital angular momentum (OAM) number (m_l) values. We analyze the effect of impact-parameter b of twisted electron beam and the laser parameters on the angular distribution of the TDCS. We study the (TDCS)_av for the macroscopic target to examine the effect of opening angle θ_p of the twisted electron beam on the angular profile of TDCS. We also observe the influence of coherent superposition of two Bessel states on the angular profile of TDCS. Our results clearly show the effects of laser parameters (electric field ε and number of photon exchanged (l)) and twisted electron beam parameters (OAM number (m_l) and opening angle (θ_p)) on the angular distribution of TDCS.","PeriodicalId":16826,"journal":{"name":"Journal of Physics B: Atomic, Molecular and Optical Physics","volume":null,"pages":null},"PeriodicalIF":1.6,"publicationDate":"2024-03-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140368890","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

Calculation of forbidden transitions in doubly ionized neodymium (Nd III) of interest for kilonova nebular phase analysis 计算千新星星云相分析所关注的双电离钕（Nd III）中的禁止转变

IF 1.6 4区物理与天体物理

Journal of Physics B: Atomic, Molecular and Optical Physics Pub Date : 2024-03-28 DOI: 10.1088/1361-6455/ad38f4

L. Maison, P. Palmeri, P. Quinet

引用次数: 0

Auger photoelectron coincidence spectroscopy of molecules adsorbed on a gold wire surface 金丝表面吸附分子的欧杰光电子巧合光谱学

IF 1.6 4区物理与天体物理

Journal of Physics B: Atomic, Molecular and Optical Physics Pub Date : 2024-03-28 DOI: 10.1088/1361-6455/ad38f5

J. Palaudoux, P. Lablanquie, R. Benbalagh, I. Ismail, A. Naitabdi, L. Huart, D. Cubaynes, Christophe Nicolas, Denis Céolin, Jean-Philippe Renault, M. Hervé du Penhoat, R. Dupuy, F. Penent

引用次数: 0