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Direct observation of ion micromotion in a linear Paul trap 线性保罗阱中离子微运动的直接观察
arXiv: Atomic Physics Pub Date : 2020-10-01 DOI: 10.1103/PHYSREVA.103.023105
Liudmila A. Zhukas, Maverick J. Millican, P. Svihra, A. Nomerotski, B. Blinov
{"title":"Direct observation of ion micromotion in a linear Paul trap","authors":"Liudmila A. Zhukas, Maverick J. Millican, P. Svihra, A. Nomerotski, B. Blinov","doi":"10.1103/PHYSREVA.103.023105","DOIUrl":"https://doi.org/10.1103/PHYSREVA.103.023105","url":null,"abstract":"In this paper, the first direct observation of micromotion for multiple ions in a laser-cooled trapped ion crystal is discussed along with a novel measurement technique for micromotion amplitude. Micromotion is directly observed using a time-resolving, single-photon sensitive camera that provides both fluorescence and position data for each ion on the nanosecond time scale. Micromotion amplitude and phase for each ion in the crystal is measured which allows this method to be sensitive to tilts and shifts of the ion chain from the null of the radiofrequency quadrupole potential in the linear trap. Spatial resolution makes this micromotion detection technique suitable for complex ion configurations, including two-dimensional geometries. It does not require any additional equipment or laser beams, and the modulation of the cooling lasers or trap voltages is not necessary for detection, as it is in other methods.","PeriodicalId":8441,"journal":{"name":"arXiv: Atomic Physics","volume":"34 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87175243","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: 7
Multiconfiguration Dirac–Hartree–Fock radiative parameters for emission lines in Ce ii–ivions and cerium opacity calculations for kilonovae 铈离子辐射线的多组态Dirac-Hartree-Fock辐射参数和千新星的铈不透明度计算
arXiv: Atomic Physics Pub Date : 2020-09-28 DOI: 10.1093/mnras/staa3729
H. Carvajal Gallego, P. Palmeri, P. Quinet
{"title":"Multiconfiguration Dirac–Hartree–Fock radiative parameters for emission lines in Ce ii–ivions and cerium opacity calculations for kilonovae","authors":"H. Carvajal Gallego, P. Palmeri, P. Quinet","doi":"10.1093/mnras/staa3729","DOIUrl":"https://doi.org/10.1093/mnras/staa3729","url":null,"abstract":"Large-scale calculations of atomic structures and radiative properties have been carried out for singly, doubly- and trebly ionized cerium. For this purpose, the purely relativistic multiconfiguration Dirac-Hartree-Fock (MCDHF) method was used, taking into account the effects of valence-valence and core-valence electronic correlations in detail. The results obtained were then used to calculate the expansion opacities characterizing the kilonovae observed as a result of neutron star mergers. Comparisons with previously published experimental and theoretical studies have shown that the results presented in this work are the most complete currently available, in terms of quantity and quality, concerning the atomic data and monochromatic opacities for Ce II, Ce III and Ce IV ions.","PeriodicalId":8441,"journal":{"name":"arXiv: Atomic Physics","volume":"14 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-09-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89422157","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: 3
Effect of the Stark shift on the low-energy interference structure in strong-field ionization 斯塔克位移对强场电离低能干涉结构的影响
arXiv: Atomic Physics Pub Date : 2020-09-17 DOI: 10.1103/PhysRevA.103.053105
Weifeng Yang, Jie Li, Wen-Wu Jia, Hongdan Zhang, Xiwang Liu, Ming Zhu, Xiaohong Song, Jiale Chen
{"title":"Effect of the Stark shift on the low-energy interference structure in strong-field ionization","authors":"Weifeng Yang, Jie Li, Wen-Wu Jia, Hongdan Zhang, Xiwang Liu, Ming Zhu, Xiaohong Song, Jiale Chen","doi":"10.1103/PhysRevA.103.053105","DOIUrl":"https://doi.org/10.1103/PhysRevA.103.053105","url":null,"abstract":"An improved quantum trajectory Monte Carlo method involving the Stark shift of the initial state, Coulomb potential, and multielectron polarization-induced dipole potential is used to revisit the origin of the low-energy interference structure in the photoelectron momentum distribution of the xenon atom subjected to an intense laser field, and resolve the different contributions of these three effects. In addition to the well-studied radial finger-like interference structure, a ring-like interference structure induced by interference among electron wave packets emitted from multi-cycle time windows of the laser field is found in the low energy part of the photoelectron momentum spectrum. It is attributed to the combined effect of the Coulomb potential and Stark shift. Our finding provides new insight into the imaging of electron dynamics of atoms and molecules with intense laser fields.","PeriodicalId":8441,"journal":{"name":"arXiv: Atomic Physics","volume":"22 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-09-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73852422","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
Stern-Gerlach Interferometry with the Atom Chip 施特恩-格拉赫干涉测量与原子芯片
arXiv: Atomic Physics Pub Date : 2020-09-17 DOI: 10.1007/978-3-030-63963-1_14
M. Keil, S. Machluf, Y. Margalit, Zhifan Zhou, Omer Amit, Or Dobkowski, Y. Japha, S. Moukouri, D. Rohrlich, Zina Binstock, Y. Bar-Haim, M. Givon, D. Groswasser, Y. Meir, R. Folman
{"title":"Stern-Gerlach Interferometry with the Atom Chip","authors":"M. Keil, S. Machluf, Y. Margalit, Zhifan Zhou, Omer Amit, Or Dobkowski, Y. Japha, S. Moukouri, D. Rohrlich, Zina Binstock, Y. Bar-Haim, M. Givon, D. Groswasser, Y. Meir, R. Folman","doi":"10.1007/978-3-030-63963-1_14","DOIUrl":"https://doi.org/10.1007/978-3-030-63963-1_14","url":null,"abstract":"","PeriodicalId":8441,"journal":{"name":"arXiv: Atomic Physics","volume":"104 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-09-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87696586","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: 7
Cascade superfluorescence in Er:YLF
arXiv: Atomic Physics Pub Date : 2020-09-13 DOI: 10.1103/PHYSREVRESEARCH.3.013138
F. Chiossi, C. Braggio, A. Khanbekyan, G. Carugno, A. Ortolan, G. Ruoso, R. Calabrese, A. Di Lieto, L. Tomassetti, M. Tonelli
{"title":"Cascade superfluorescence in Er:YLF","authors":"F. Chiossi, C. Braggio, A. Khanbekyan, G. Carugno, A. Ortolan, G. Ruoso, R. Calabrese, A. Di Lieto, L. Tomassetti, M. Tonelli","doi":"10.1103/PHYSREVRESEARCH.3.013138","DOIUrl":"https://doi.org/10.1103/PHYSREVRESEARCH.3.013138","url":null,"abstract":"We report the analysis of paired photon pulses arising from two cascading transitions in continuously pumped Erbium-doped YLiF$_4$ 1% and 0.01% crystals at 1.6 K. The dependence of the pulse peak intensity on the squared number of involved Erbium ions, between 10$^{11}$ and 10$^{13}$, definitely identifies the cooperative nature of the two pulsed emissions, that are generated by the subsequent, spontaneous formation of coherent states. The observed fluctuations of the time interval between the paired pulses and, most importantly, its correlation with the second pulse duration, demonstrate that the Erbium ions coherence is indeed seeded by vacuum fluctuations.","PeriodicalId":8441,"journal":{"name":"arXiv: Atomic Physics","volume":"19 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-09-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90905138","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: 5
Hyperfine-mediated effects in a Lu+ optical clock Lu+光时钟中的超精细介导效应
arXiv: Atomic Physics Pub Date : 2020-09-07 DOI: 10.1103/physreva.102.052834
Zhiqiang Zhang, K. Arnold, R. Kaewuam, Marianna Safronova, M. D. Barrett
{"title":"Hyperfine-mediated effects in a \u0000Lu+\u0000 optical clock","authors":"Zhiqiang Zhang, K. Arnold, R. Kaewuam, Marianna Safronova, M. D. Barrett","doi":"10.1103/physreva.102.052834","DOIUrl":"https://doi.org/10.1103/physreva.102.052834","url":null,"abstract":"We consider hyperfine-mediated effects for clock transitions in $^{176}$Lu$^+$. Mixing of fine structure levels due to the hyperfine interaction bring about modifications to Lande $g$-factors and the quadrupole moment for a given state. Explicit expressions are derived for both $g$-factor and quadrupole corrections, for which leading order terms arise from the nuclear magnetic dipole coupling. High accuracy measurements of the $g$-factors for the $^1S_0$ and $^3D_1$ hyperfine levels are carried out, which provide an experimental determination of the leading order correction terms.","PeriodicalId":8441,"journal":{"name":"arXiv: Atomic Physics","volume":"18 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-09-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78442987","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: 3
High-energy-resolution measurements of an ultracold-atom–ion collisional cross section 超低温原子-离子碰撞截面的高能量分辨率测量
arXiv: Atomic Physics Pub Date : 2020-09-07 DOI: 10.1103/PHYSREVA.103.032805
Ruti Ben-shlomi, Meirav Pinkas, Z. Meir, T. Sikorsky, O. Katz, N. Akerman, R. Ozeri
{"title":"High-energy-resolution measurements of an ultracold-atom–ion collisional cross section","authors":"Ruti Ben-shlomi, Meirav Pinkas, Z. Meir, T. Sikorsky, O. Katz, N. Akerman, R. Ozeri","doi":"10.1103/PHYSREVA.103.032805","DOIUrl":"https://doi.org/10.1103/PHYSREVA.103.032805","url":null,"abstract":"The cross section of a given process fundamentally quantifies the probability for that given process to occur. In the quantum regime of low energies, the cross section can vary strongly with collision energy due to quantum effects. Here, we report on a method to directly measure the atom-ion collisional cross section in the energy range of 0.2-12 mK$cdot$ k$_B$, by shuttling ultracold atoms trapped in an optical-lattice across a radio-frequency trapped ion. In this method, the average number of atom-ion collisions per experiment is below one such that the energy resolution is not limited by the broad (power-law) steady-state atom-ion energy distribution. Here, we estimate that the energy resolution is below 200 $mu$K$cdot$k$_B$, limited by drifts in the ion's excess micromotion compensation and can be reduced to the 10's $mu$K$cdot$k$_B$ regime. This resolution is one order-of-magnitude better than previous experiments measuring cold atom-ion collisional cross section energy dependence. We used our method to measure the energy dependence of the inelastic collision cross sections of a non-adiabatic Electronic-Excitation-Exchange (EEE) and Spin-Orbit Change (SOC) processes. We found that in the measured energy range, the EEE and SOC cross sections statistically agree with the classical Langevin cross section. This method allows for measuring the cross sections of various inelastic processes and opens up possibilities to search for atom-ion quantum signatures such as shape-resonances.","PeriodicalId":8441,"journal":{"name":"arXiv: Atomic Physics","volume":"7 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-09-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86635086","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: 6
Direct measurement of the 7s2S1/2→7p2P3/2 transition frequency in Ra+226 Ra+226中7s2S1/2→7p2P3/2跃迁频率的直接测量
arXiv: Atomic Physics Pub Date : 2020-08-30 DOI: 10.1103/PHYSREVA.102.042822
C. A. Holliman, M. Fan, A. Contractor, M. Straus, A. Jayich
{"title":"Direct measurement of the \u00007s2S1/2→7p2P3/2\u0000 transition frequency in \u0000Ra+226","authors":"C. A. Holliman, M. Fan, A. Contractor, M. Straus, A. Jayich","doi":"10.1103/PHYSREVA.102.042822","DOIUrl":"https://doi.org/10.1103/PHYSREVA.102.042822","url":null,"abstract":"We report a direct measurement of the $7s ^2S_{1/2}rightarrow$ $7p ^2P_{3/2}$ electric-dipole transition frequency in $^{226}$Ra$^{+}$. With a single laser-cooled radium ion we determine the transition frequency to be 785722.11(3) GHz by directly driving the transition with frequency doubled light and measuring the frequency of the un-doubled light with an iodine reference. This measurement addresses a discrepancy of five combined standard deviations between previously reported values.","PeriodicalId":8441,"journal":{"name":"arXiv: Atomic Physics","volume":"81 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-08-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83978302","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
Pulsed Ion Microscope to Probe Quantum Gases 脉冲离子显微镜探测量子气体
arXiv: Atomic Physics Pub Date : 2020-08-19 DOI: 10.1103/PHYSREVX.11.011036
C. Veit, N. Zuber, O. Herrera-Sancho, V. S. Anasuri, T. Schmid, F. Meinert, R. Löw, T. Pfau
{"title":"Pulsed Ion Microscope to Probe Quantum Gases","authors":"C. Veit, N. Zuber, O. Herrera-Sancho, V. S. Anasuri, T. Schmid, F. Meinert, R. Löw, T. Pfau","doi":"10.1103/PHYSREVX.11.011036","DOIUrl":"https://doi.org/10.1103/PHYSREVX.11.011036","url":null,"abstract":"The advent of the quantum gas microscope allowed for the in situ probing of ultracold gaseous matter on an unprecedented level of spatial resolution. The study of phenomena on ever smaller length scales as well as the probing of three-dimensional systems is, however, fundamentally limited by the wavelength of the imaging light, for all techniques based on linear optics. Here we report on a high-resolution ion microscope as a versatile and powerful experimental tool to investigate quantum gases. The instrument clearly resolves atoms in an optical lattice with a spacing of $532,text{nm}$ over a field of view of 50 sites and offers an extremely large depth of field on the order of at least $70,mutext{m}$. With a simple model, we extract an upper limit for the achievable resolution of approximately $200,text{nm}$ from our data. We demonstrate a pulsed operation mode which in the future will enable 3D imaging and allow for the study of ionic impurities and Rydberg physics.","PeriodicalId":8441,"journal":{"name":"arXiv: Atomic Physics","volume":"45 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-08-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79045429","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: 19
Trapping, Cooling, and Photodissociation Analysis of State-Selected H2+ Ions Produced by (3+1) Multiphoton Ionization (3+1)多光子电离产生的状态选择H2+离子的俘获、冷却和光解分析
arXiv: Atomic Physics Pub Date : 2020-08-19 DOI: 10.1103/PhysRevApplied.14.024053
Julian Schmidt, T. Louvradoux, J. Heinrich, N. Sillitoe, M. Simpson, J. Karr, L. Hilico
{"title":"Trapping, Cooling, and Photodissociation Analysis of State-Selected \u0000H2+\u0000 Ions Produced by (\u00003+1\u0000) Multiphoton Ionization","authors":"Julian Schmidt, T. Louvradoux, J. Heinrich, N. Sillitoe, M. Simpson, J. Karr, L. Hilico","doi":"10.1103/PhysRevApplied.14.024053","DOIUrl":"https://doi.org/10.1103/PhysRevApplied.14.024053","url":null,"abstract":"We report on the production of cold, state-selected H$_2^+$ molecular ions in a linear RF trap. The ions are produced by (3+1) resonance-enhanced multi-photon ionisation (REMPI) of H$_2$, and sympathetically cooled by laser-cooled Be$^+$ ions. After demonstrating and characterizing the REMPI process, we use photodissociation by a deep UV laser at 213~nm to verify the high vibrational purity of the produced H$_2^+$ ion samples. Moreover, the large difference between the photodissociation efficiencies of ions created in the $v=0$ and $v=1$ levels provides a way to detect a $v=0 to 1$ transition. These results pave the way towards high-resolution vibrational spectroscopy of H$_2^+$ for fundamental metrology applications.","PeriodicalId":8441,"journal":{"name":"arXiv: Atomic Physics","volume":"43 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-08-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90787578","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: 12
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