Amir Mohammadi, A. Krükow, A. Mahdian, M. Deiss, J. Pérez-Ríos, H. da Silva, M. Raoult, O. Dulieu, J. Hecker Denschlag
{"title":"Life and death of a cold \u0000BaRb+\u0000 molecule inside an ultracold cloud of Rb atoms","authors":"Amir Mohammadi, A. Krükow, A. Mahdian, M. Deiss, J. Pérez-Ríos, H. da Silva, M. Raoult, O. Dulieu, J. Hecker Denschlag","doi":"10.1103/PHYSREVRESEARCH.3.013196","DOIUrl":"https://doi.org/10.1103/PHYSREVRESEARCH.3.013196","url":null,"abstract":"We study the evolution of a single BaRb$^+$ molecule while it continuously collides with ultracold Rb atoms. The initially weakly-bound molecule can undergo a sequence of elastic, inelastic, reactive, and radiative processes. We investigate these processes by developing methods for discriminating between different ion species, electronic states, and kinetic ion energy ranges. By comparing the measurements to model calculations we obtain a consistent description of the typical trajectory of the ion through the manifold of available atomic and molecular states. As a further result, we determine rates for collisional and radiative relaxation as well as photodissociation, spin-flip collisions, and chemical reactions.","PeriodicalId":8441,"journal":{"name":"arXiv: Atomic Physics","volume":"19 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-05-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89267364","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}
J. McGilligan, J. McGilligan, K. Moore, A. Dellis, A. Dellis, G. Martinez, G. Martinez, E. Clercq, P. Griffin, A. Arnold, E. Riis, R. Boudot, R. Boudot, J. Kitching
{"title":"Laser cooling in a chip-scale platform","authors":"J. McGilligan, J. McGilligan, K. Moore, A. Dellis, A. Dellis, G. Martinez, G. Martinez, E. Clercq, P. Griffin, A. Arnold, E. Riis, R. Boudot, R. Boudot, J. Kitching","doi":"10.1063/5.0014658","DOIUrl":"https://doi.org/10.1063/5.0014658","url":null,"abstract":"Chip-scale atomic devices built around micro-fabricated alkali vapor cells are at the forefront of compact metrology and atomic sensors. We demonstrate a micro-fabricated vapor cell that is actively-pumped to ultra-high-vacuum (UHV) to achieve laser cooling. A grating magneto optical trap (GMOT) is incorporated with the 4 mm-thick Si/glass vacuum cell to demonstrate the feasibility of a fully-miniaturized laser cooling platform. A two-step optical excitation process in rubidium is used to overcome surface-scatter limitations to the GMOT imaging. The unambiguous miniaturization and form-customizability made available with micro-fabricated UHV cells provide a promising platform for future compact cold-atom sensors.","PeriodicalId":8441,"journal":{"name":"arXiv: Atomic Physics","volume":"32 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-05-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90839477","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}
M. Abdel Hafiz, R. Vicarini, N. Passilly, C. Calosso, V. Maurice, J. Pollock, A. Taichenachev, V. Yudin, J. Kitching, R. Boudot
{"title":"Protocol for Light-Shift Compensation in a Continuous-Wave Microcell Atomic Clock","authors":"M. Abdel Hafiz, R. Vicarini, N. Passilly, C. Calosso, V. Maurice, J. Pollock, A. Taichenachev, V. Yudin, J. Kitching, R. Boudot","doi":"10.1103/PHYSREVAPPLIED.14.034015","DOIUrl":"https://doi.org/10.1103/PHYSREVAPPLIED.14.034015","url":null,"abstract":"Light-shifts are known to be an important limitation to the mid- and long-term fractional frequency stability of different types of atomic clocks. In this article, we demonstrate the experimental implementation of an advanced anti-light shift interrogation protocol onto a continuous-wave (CW) microcell atomic clock based on coherent population trapping (CPT). The method, inspired by the Auto-Balanced Ramsey (ABR) spectroscopy technique demonstrated in pulsed atomic clocks, consists in the extraction of atomic-based information from two successive light-shifted clock frequencies obtained at two different laser power values. Two error signals, computed from the linear combination of signals acquired along a symmetric sequence, are managed in a dual-loop configuration to generate a clock frequency free from light-shift. Using this method, the sensitivity of the clock frequency to both laser power and microwave power variations can be reduced by more than an order of magnitude compared to normal operation. In the present experiment, the consideration of the non-linear light-shift dependence allowed to enhance light-shift mitigation. The implemented technique allows a clear improvement of the clock Allan deviation for time scales higher than 1000 s. This method could be applied in various kinds of atomic clocks such as CPT-based atomic clocks, double-resonance Rb clocks, or cell-stabilized lasers.","PeriodicalId":8441,"journal":{"name":"arXiv: Atomic Physics","volume":"40 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-05-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73870474","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}
V. A. Gradusov, V. Roudnev, E. Yarevsky, S. Yakovlev
{"title":"Solving the Faddeev-Merkuriev equations in total orbital momentum representation via spline collocation and tensor product preconditioning","authors":"V. A. Gradusov, V. Roudnev, E. Yarevsky, S. Yakovlev","doi":"10.4208/CICP.OA-2020-0097","DOIUrl":"https://doi.org/10.4208/CICP.OA-2020-0097","url":null,"abstract":"The computational approach for solving the Faddeev-Merkuriev equations in total orbital momentum representation is presented. These equations describe a system of three quantum charged particles and are widely used in bound state and scattering calculations. The approach is based on the spline collocation method and exploits intensively the tensor product form of discretized operators and preconditioner, which leads to a drastic economy in both computer resources and time.","PeriodicalId":8441,"journal":{"name":"arXiv: Atomic Physics","volume":"54 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-05-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73517840","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}
M. Diouf, F. Cozijn, K.-F. Lai, E. Salumbides, W. Ubachs
{"title":"Lamb-peak spectrum of the HD (2-0) P(1) line","authors":"M. Diouf, F. Cozijn, K.-F. Lai, E. Salumbides, W. Ubachs","doi":"10.1103/physrevresearch.2.023209","DOIUrl":"https://doi.org/10.1103/physrevresearch.2.023209","url":null,"abstract":"A saturation spectroscopy measurement of the P(1) line of the ($2-0$) band in HD is performed in a sensitive cavity-enhanced optical setup involving frequency comb calibration. The spectral signature is that of a Lamb-peak, in agreement with a density-matrix model description involving 9 hyperfine components and 16 crossover resonances of $Lambda$-type. Comparison of the experimental spectra with the simulations yields a rovibrational transition frequency at 209,784,242,007 (20) kHz. Agreement is found with a first principles calculation in the framework of non-adiabatic quantum electrodynamics within 2$sigma$, where the combined uncertainty is fully determined by theory.","PeriodicalId":8441,"journal":{"name":"arXiv: Atomic Physics","volume":"21 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-05-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81539953","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}
F. Kröger, G. Weber, M. O. Herdrich, J. Glorius, C. Langer, Z. Slavkovská, L. Bott, C. Brandau, B. Brückner, K. Blaum, X. Chen, S. Dababneh, T. Davinson, P. Erbacher, S. Fiebiger, T. Gassner, K. Göbel, M. Groothuis, A. Gumberidze, G. Gyürky, S. Hagmann, C. Hahn, M. Heil, R. Hess, R. Hensch, P. Hillmann, P. Hillenbrand, O. Hinrichs, B. Jurado, T. Kausch, A. Khodaparast, T. Kisselbach, N. Klapper, C. Kozhuharov, D. Kurtulgil, G. Lane, C. Lederer-Woods, M. Lestinsky, S. Litvinov, Y. Litvinov, B. Löher, F. Nolden, N. Petridis, U. Popp, M. Reed, R. Reifarth, M. S. Sanjari, H. Simon, U. Spillmann, M. Steck, J. Stumm, T. Szücs, T. T. Nguyen, A. Taremi Zadeh, B. Thomas, S. Torilov, H. Törnqvist, C. Trageser, S. Trotsenko, M. Volknandt, M. Weigand, C. Wolf, P. Woods, V. P. Shevelko, I. Tolstikhina, T. Stöhlker
{"title":"Electron capture of \u0000Xe54+\u0000 in collisions with \u0000H2\u0000 molecules in the energy range between 5.5 and 30.9 MeV/u","authors":"F. Kröger, G. Weber, M. O. Herdrich, J. Glorius, C. Langer, Z. Slavkovská, L. Bott, C. Brandau, B. Brückner, K. Blaum, X. Chen, S. Dababneh, T. Davinson, P. Erbacher, S. Fiebiger, T. Gassner, K. Göbel, M. Groothuis, A. Gumberidze, G. Gyürky, S. Hagmann, C. Hahn, M. Heil, R. Hess, R. Hensch, P. Hillmann, P. Hillenbrand, O. Hinrichs, B. Jurado, T. Kausch, A. Khodaparast, T. Kisselbach, N. Klapper, C. Kozhuharov, D. Kurtulgil, G. Lane, C. Lederer-Woods, M. Lestinsky, S. Litvinov, Y. Litvinov, B. Löher, F. Nolden, N. Petridis, U. Popp, M. Reed, R. Reifarth, M. S. Sanjari, H. Simon, U. Spillmann, M. Steck, J. Stumm, T. Szücs, T. T. Nguyen, A. Taremi Zadeh, B. Thomas, S. Torilov, H. Törnqvist, C. Trageser, S. Trotsenko, M. Volknandt, M. Weigand, C. Wolf, P. Woods, V. P. Shevelko, I. Tolstikhina, T. Stöhlker","doi":"10.1103/physreva.102.042825","DOIUrl":"https://doi.org/10.1103/physreva.102.042825","url":null,"abstract":"The electron capture process was studied for Xe$^{54+}$ colliding with H$_2$ molecules at the internal gas target of the ESR storage ring at GSI, Darmstadt. Cross section values for electron capture into excited projectile states were deduced from the observed emission cross section of Lyman radiation, being emitted by the hydrogen-like ions subsequent to the capture of a target electron. The ion beam energy range was varied between 5.5 MeV/u and 30.9 MeV/u by applying the deceleration mode of the ESR. Thus, electron capture data was recorded at the intermediate and in particular the low collision energy regime, well below the beam energy necessary to produce bare xenon ions. The obtained data is found to be in reasonable qualitative agreement with theoretical approaches, while a commonly applied empirical formula significantly overestimates the experimental findings.","PeriodicalId":8441,"journal":{"name":"arXiv: Atomic Physics","volume":"16 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-05-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80839050","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}
{"title":"Full-dimensional quantum scattering calculations on ultracold atom-molecule collisions in magnetic fields: The role of molecular vibrations","authors":"M. Morita, J. Kłos, T. Tscherbul","doi":"10.1103/physrevresearch.2.043294","DOIUrl":"https://doi.org/10.1103/physrevresearch.2.043294","url":null,"abstract":"Rigorous quantum scattering calculations on ultracold molecular collisions in external fields present an outstanding computational problem due to strongly anisotropic atom-molecule interactions that depend on the relative orientation of the collision partners, as well as on their vibrational degrees of freedom. Here, we present the first numerically exact three-dimensional quantum scattering calculations on strongly anisotropic atom-molecule (Li+CaH) collisions in an external magnetic field based on the parity-adapted total angular momentum representation and a new three-dimensional potential energy surface (PES) for the triplet Li-CaH collision complex using the unrestricted coupled cluster method with single, double and perturbative triple excitations [UCCSD(T)] and a large quadruple-zeta type basis set. We find that while the full three-dimensional treatment is necessary for the accurate description of Li ($M_S=1/2$)+CaH ($v=0,N=0,M_S=1/2$) collisions as a function of magnetic field, the magnetic resonance density and statistical properties of spin-polarized atom-molecule collisions are not strongly affected by vibrational degrees of freedom, justifying the rigid-rotor approximation used in previous calculations. We observe rapid, field-insensitive vibrational quenching in ultracold Li ($M_S=1/2$)+CaH ($v=1,N=0, M_S=1/2$) collisions, leading to efficient collisional cooling of CaH vibrations.","PeriodicalId":8441,"journal":{"name":"arXiv: Atomic Physics","volume":"49 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-05-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74941168","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}
Fang Fang, J. Isaacs, A. Smull, K. Horn, L. D. Robledo-De Basabe, Yimeng Wang, C. Greene, D. Stamper-Kurn
{"title":"Collisional spin transfer in an atomic heteronuclear spinor Bose gas","authors":"Fang Fang, J. Isaacs, A. Smull, K. Horn, L. D. Robledo-De Basabe, Yimeng Wang, C. Greene, D. Stamper-Kurn","doi":"10.1103/PHYSREVRESEARCH.2.032054","DOIUrl":"https://doi.org/10.1103/PHYSREVRESEARCH.2.032054","url":null,"abstract":"We observe spin transfer within a non-degenerate heteronuclear spinor atomic gas comprised of a small $^7$Li population admixed with a $^{87}$Rb bath, with both elements in their $F=1$ hyperfine spin manifolds and at temperatures of 10's of $mu$K. Prepared in a non-equilibrium initial state, the $^7$Li spin distribution evolves through incoherent spin-changing collisions toward a steady-state distribution. We identify and measure the cross-sections of all three types of spin-dependent heteronuclear collisions, namely the spin-exchange, spin-mixing, and quadrupole-exchange interactions, and find agreement with predictions of heteronuclear $^7$Li-$^{87}$Rb interactions at low energy. Moreover, we observe that the steady state of the $^7$Li spinor gas can be controlled by varying the composition of the $^{87}$Rb spin bath with which it interacts.","PeriodicalId":8441,"journal":{"name":"arXiv: Atomic Physics","volume":"23 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-04-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90971252","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}
{"title":"Interatomic-distance dependence of resonant energy-transfer phenomena","authors":"F. Grull, A. Voitkiv, C. Muller","doi":"10.1103/PHYSREVRESEARCH.2.033303","DOIUrl":"https://doi.org/10.1103/PHYSREVRESEARCH.2.033303","url":null,"abstract":"It is well known that interatomic or intermolecular interactions driven by two-center electronic dipole-dipole correlations fall off rapidly with the inter-site distance. We show, however, that the effective strength of interatomic reaction channels, which are triggered by a resonant field, can exhibit a nonmonotonous distance dependence, being strongly reduced when the atoms come closer. This surprising result is demonstrated by considering resonant two-center photoionization as an example. Our findings are supported by available experimental data.","PeriodicalId":8441,"journal":{"name":"arXiv: Atomic Physics","volume":"15 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-04-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73830974","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}
{"title":"Long-range Rydberg molecule \u0000Rb2\u0000: Two-electron \u0000R\u0000-matrix calculations at intermediate internuclear distances","authors":"M. Tarana","doi":"10.1103/physreva.102.062802","DOIUrl":"https://doi.org/10.1103/physreva.102.062802","url":null,"abstract":"The adiabatic potential energy curves of Rb$_2$ in the long-range Rydberg electronic states are calculated using the two-electron textit{R}-matrix method [M. Tarana, R. Curik, Phys. Rev. A textbf{93}, 012515 (2016)] for the intermediate internuclear separations between 35 a.u. and 200 a.u. The results are compared with the zero-range models to find a region of the internuclear distances where the Fermi's pseudopotential approach provides accurate energies. A finite-range potential model of the atomic perturber is used to calculate the wave functions of the Rydberg electron and their features specific for the studied range of internuclear distances are identified.","PeriodicalId":8441,"journal":{"name":"arXiv: Atomic Physics","volume":"68 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-03-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76214039","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}
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