arXiv: Atomic Physics最新文献_第9页

Searches for New Particles Including Dark Matter with Atomic, Molecular and Optical Systems 用原子、分子和光学系统搜索包括暗物质在内的新粒子

arXiv: Atomic Physics Pub Date : 2018-06-08 DOI: 10.1007/978-3-030-73893-8_31

Y. Stadnik, V. Flambaum

引用次数: 8

Enhanced sensitivity to ultralight bosonic dark matter in the spectra of the linear radical SrOH 线性自由基SrOH光谱对超轻玻色子暗物质的灵敏度增强

arXiv: Atomic Physics Pub Date : 2018-05-21 DOI: 10.1103/PHYSREVA.103.043313

I. Kozyryev, Z. Lasner, J. Doyle

{"title":"Enhanced sensitivity to ultralight bosonic dark matter in the spectra of the linear radical SrOH","authors":"I. Kozyryev, Z. Lasner, J. Doyle","doi":"10.1103/PHYSREVA.103.043313","DOIUrl":"https://doi.org/10.1103/PHYSREVA.103.043313","url":null,"abstract":"Coupling between Standard Model particles and theoretically well-motivated ultralight dark matter (UDM) candidates can lead to time variation of fundamental constants including the proton-to-electron mass ratio $muequiv m_{p}/m_{e}approx1836$. The presence of nearly-degenerate vibrational energy levels of different character in polyatomic molecules can result in significantly enhanced relative energy shifts in molecular spectra originating from $partial_{t}mu$, relaxing experimental complexity required for high-sensitivity measurements. We analyze the amplification of UDM effects in the spectrum of laser-cooled strontium monohydroxide (SrOH). SrOH is the first and, so far, the only polyatomic molecule to be directly laser cooled to sub-millikelvin temperatures, opening the possibility of long experimental coherence times. Because of the high enhancement factors ($left|Q_{mu}right|approx10^{3}$), measurements of the $tilde{X}left(200right)leftrightarrowtilde{X}left(03^{1}0right)$ rovibrational transitions of SrOH in the microwave regime can result in $sim10^{-17}$ fractional uncertainty in $deltamu/mu$ with one day of integration. Furthermore, ultracold SrOH provides a promising platform for suppressing systematic errors. More complex SrOR radicals with additional vibrational modes arising from larger ligands R could lead to even greater enhancement factors.","PeriodicalId":8441,"journal":{"name":"arXiv: Atomic Physics","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2018-05-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90769174","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: 24

Structure of the Balmer jump. The isolated hydrogen atom. 巴尔默跳的结构。孤立的氢原子。

arXiv: Atomic Physics Pub Date : 2018-05-01 DOI: 10.1051/0004-6361/201731974

F. Calvo, L. Belluzzi, O. Steiner

{"title":"Structure of the Balmer jump. The isolated hydrogen atom.","authors":"F. Calvo, L. Belluzzi, O. Steiner","doi":"10.1051/0004-6361/201731974","DOIUrl":"https://doi.org/10.1051/0004-6361/201731974","url":null,"abstract":"Context. The spectrum of the hydrogen atom was explained by Bohr more than one century ago. We revisit here some of the aspects of the underlying quantum structure, with a modern formalism, focusing on the limit of the Balmer series. \u0000Aims. We investigate the behaviour of the absorption coefficient of the isolated hydrogen atom in the neighbourhood of the Balmer limit. \u0000Methods. We analytically computed the total cross-section arising from bound-bound and bound-free transitions in the isolated hydrogen atom at the Balmer limit, and established a simplified semi-analytical model for the surroundings of that limit. We worked within the framework of the formalism of Landi Degl'Innocenti & Landolfi (2004, Astrophys. Space Sci. Lib., 307), which permits an almost straight-forward generalization of our results to other atoms and molecules, and which is perfectly suitable for including polarization phenomena in the problem. \u0000Results. We analytically show that there is no discontinuity at the Balmer limit, even though the concept of a \"Balmer jump\" is still meaningful. Furthermore, we give a possible definition of the location of the Balmer jump, and we check that this location is dependent on the broadening mechanisms. At the Balmer limit, we compute the cross-section in a fully analytical way. \u0000Conclusions. The Balmer jump is produced by a rapid drop of the total Balmer cross-section, yet this variation is smooth and continuous when both bound-bound and bound-free processes are taken into account, and its shape and location is dependent on the broadening mechanisms.","PeriodicalId":8441,"journal":{"name":"arXiv: Atomic Physics","volume":"46 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2018-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72546300","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

Radio-over-fiber using an optical antenna based on Rydberg states of atoms 使用基于原子里德伯态的光学天线的光纤无线电

arXiv: Atomic Physics Pub Date : 2018-03-26 DOI: 10.1063/1.5031033

A. Deb, N. Kjærgaard

引用次数: 60

New Physics Searches Using Precision Spectroscopy 使用精密光谱学的新物理搜索

arXiv: Atomic Physics Pub Date : 2018-02-18 DOI: 10.1016/BS.AAMOP.2018.02.001

C. Orzel

引用次数: 1

Analysis of Short-Term Stability of Miniature 171Yb+ Buffer Gas Cooled Trapped Ion Clock 微型171Yb+缓冲气冷阱离子钟的短期稳定性分析

arXiv: Atomic Physics Pub Date : 2018-02-13 DOI: 10.33012/2018.15609

D. R. Scherer, C. Boschen, J. Noble, Mike Silveira, Dwayne Taylor, J. Tallant, K. Overstreet, S. Stein

引用次数: 5

Gauge-invariant formulation of time-dependent configuration interaction singles method 时变组态相互作用单方法的规范不变公式

arXiv: Atomic Physics Pub Date : 2018-02-07 DOI: 10.3390/app8030433

Takeshi Sato, T. Teramura, K. Ishikawa

{"title":"Gauge-invariant formulation of time-dependent configuration interaction singles method","authors":"Takeshi Sato, T. Teramura, K. Ishikawa","doi":"10.3390/app8030433","DOIUrl":"https://doi.org/10.3390/app8030433","url":null,"abstract":"We propose a gauge-invariant formulation of the channel orbital-based time-dependent configuration interaction singles (TDCIS) method [Phys. Rev. A 74, 043420 (2006)], one of the powerful ab initio methods to investigate electron dynamics in atoms and molecules subject to an external laser field. In the present formulation, we derive the equations of motion (EOMs) in the velocity gauge using gauge-transformed orbitals, not fixed orbitals, that are equivalent to the conventional EOMs in the length gauge using fixed orbitals. The new velocity-gauge EOMs avoid the use of the length-gauge dipole operator, which diverges at large distance, and allows to exploit computational advantages of the velocity-gauge treatment over the length-gauge one, e.g, a faster convergence in simulations with intense and long-wavelength lasers, and the feasibility of exterior complex scaling as an absorbing boundary. The reformulated TDCIS method is applied to an exactly solvable model of one-dimensional helium atom in an intense laser field to numerically demonstrate the gauge invariance. We also discuss the consistent method for evaluating the time derivative of an observable, relevant e.g, in simulating high-harmonic generation.","PeriodicalId":8441,"journal":{"name":"arXiv: Atomic Physics","volume":"45 1","pages":"433"},"PeriodicalIF":0.0,"publicationDate":"2018-02-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83234677","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: 13

Dielectronic recombination data for dynamic finite-density plasmas XV. The silicon isoelectronic sequence 动态有限密度等离子体的介电子复合数据。硅等电子序列

arXiv: Atomic Physics Pub Date : 2018-01-30 DOI: 10.1051/0004-6361/201731243

Jagjit Kaur, T. Gorczyca, N. Badnell

{"title":"Dielectronic recombination data for dynamic finite-density plasmas XV. The silicon isoelectronic sequence","authors":"Jagjit Kaur, T. Gorczyca, N. Badnell","doi":"10.1051/0004-6361/201731243","DOIUrl":"https://doi.org/10.1051/0004-6361/201731243","url":null,"abstract":"We aim to present a comprehensive theoretical investigation of dielectronic recombination (DR) of the silicon-like isoelectronic sequence and provide DR and radiative recombination (RR) data that can be used within a generalized collisional-radiative modelling framework. Total and final-state level-resolved DR and RR rate coefficients for the ground and metastable initial levels of 16 ions between $rm{P^{+}}$ and $rm{Zn^{16+}}$ are determined. We carried out multi-configurational Breit-Pauli (MCBP) DR calculations for silicon-like ions in the independent processes, isolated resonance, distorted wave (IPIRDW) approximation. Both $Delta n_c =0$ and $Delta n_c =1$ core excitations are included using $LS$ and intermediate coupling schemes. Results are presented for a selected number of ions and compared to all other existing theoretical and experimental data. The total dielectronic and radiative recombination rate coefficients for the ground state are presented in tabulated form for easy implementation into spectral modelling codes. These data can also be accessed from the Atomic Data and Analysis Structure (ADAS) OPEN-ADAS database. This work is a part of an assembly of a dielectronic recombination database for the modelling of dynamic finite-density plasmas.","PeriodicalId":8441,"journal":{"name":"arXiv: Atomic Physics","volume":"34 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2018-01-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79161026","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: 48

Retardation effects in spectroscopic measurements of the Casimir-Polder interaction 卡西米尔-波德相互作用光谱测量中的延迟效应

arXiv: Atomic Physics Pub Date : 2018-01-18 DOI: 10.1103/physreva.97.023806

J. C. Carvalho, P. Pedri, M. Ducloy, A. Laliotis

引用次数: 6

Laser-stimulated electric quadrupole transitions in the molecular hydrogen ion H2+ 激光激发氢离子H2+分子中的电四极跃迁

arXiv: Atomic Physics Pub Date : 2018-01-15 DOI: 10.1103/PhysRevA.97.032505

V. Korobov, P. Danev, D. Bakalov, S. Schiller

引用次数: 9