Bulletin of the American Physical Society
52nd Annual Meeting of the APS Division of Atomic, Molecular and Optical Physics
Volume 66, Number 6
Monday–Friday, May 31–June 4 2021; Virtual; Time Zone: Central Daylight Time, USA
Session U05: Precision Atomic PhysicsLive
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Chair: Colin Kennedy, NIST |
Thursday, June 3, 2021 2:00PM - 2:12PM Live |
U05.00001: Portal for High-Precision Atomic Data and Computation Adam Marrs, Parinaz Barakhshan, Marianna S Safronova, Rudolf Eigenmann We are reporting a release of the Version 1 of the online atomic portal for high-precision atomic data and computation. This portal provides transition matrix elements, transition rates, radiative lifetimes, branching ratios, hyperfine constants, quadrupole moments, and scalar and dynamic polarizabilities for atoms and ions. Version 1 includes data for Li, Be+, Na, Mg+, K, Ca+, Rb, Sr+, Cs, Ba+, Fr, and Ra+. The atomic properties are calculated using a high-precision state-of-the-art linearized coupled-cluster method. All values include estimated uncertainties. Experimental values are included with references where high-precision data are available. Data for more systems will be added in the future, with alkaline earth metal atoms planned for the next release. Future updates will also include releases of user-friendly atomic codes. We seek community input to improve the portal and guide the next stages of the project. |
Thursday, June 3, 2021 2:12PM - 2:24PM Live |
U05.00002: Development of parallel relativistic atomic codes for accurate treatment of complex systems Charles Cheung, Marianna S Safronova, Sergey G Porsev, Mikhail Kozlov There has been an increasing need for high quality high-precision atomic data and software for studies of fundamental interactions, development of atomic clocks and other ultracold atom experiments, astrophysics, plasma science, precision measurements, and many others. We have developed new parallel atomic structure codes that enable accurate computations that were not possible before due to system complexity and allow much quicker computations with higher accuracy for simpler systems. Our new parallel codes have achieved near-perfect linear scalability with very high efficiency for calculations done so far. Applications of new code package to predict properties of a wide range of systems, from negative to highly-charged ions, will be reported. The new codes will also be used to produce large volumes of atomic data for a new online portal being developed at the University of Delaware. |
Thursday, June 3, 2021 2:24PM - 2:36PM Live |
U05.00003: Precision spectroscopy of the 2S-6P transition in atomic hydrogen Lothar Maisenbacher, Vitaly Wirthl, Arthur Matveev, Alexey Grinin, Randolf Pohl, Thomas Udem, Theodor Hansch Precision spectroscopy of atomic hydrogen (H) is an important way to extract physical constants and test bound-state quantum electrodynamics (QED), one of the building blocks of the Standard Model. Both the Rydberg constant R∞ and the proton charge radius rp can be determined by H spectroscopy with high precision, with a comparison of the values of R∞ and rp determined from measurements of different transitions constituting a test of QED. |
Thursday, June 3, 2021 2:36PM - 2:48PM Live |
U05.00004: Towards precision spectroscopy of the 2S-6P transition in atomic deuterium Vitaly Wirthl, Lothar Maisenbacher, Alexey Grinin, Derya Taray, Arthur Matveev, Randolf Pohl, Theodor Hansch, Thomas Udem Similar to atomic hydrogen, atomic deuterium can be used to determine physical constants and to test Quantum Electrodynamics. The isotope shift of the 1S-2S transition links measurements between hydrogen and deuterium through the squared deuteron-proton charge radius difference [1]. A combination of the 1S-2S transition frequency with additional measurements in deuterium determines the deuteron radius independent of the proton radius [2]. However, these determinations are discrepant with results obtained in muonic deuterium [3]. Contrary to hydrogen [4], no recent measurements in deuterium are available. We are working towards a measurement of the 2S-6P transition in deuterium. Compared to hydrogen, precision spectroscopy of the same transition in deuterium is complicated by simultaneous excitation of hyperfine transitions, possibly leading to unresolved quantum interference [5]. Since these effects depend on laser polarization, we developed an active fiber-based retroreflector with a polarization monitor [6]. Furthermore, we find that in our case the unresolved quantum interference is suppressed, making a 2S-6P deuterium measurement with similar precision as for hydrogen feasible. |
Thursday, June 3, 2021 2:48PM - 3:00PM Live |
U05.00005: Dynamic Scalar Polarizability and Photoionization Cross Section Measurements of the Rb 5D3/2 Level Ryan J Cardman, Alisher Duspayev, Jamie L MacLennan, Xiaoxuan Han, Georg A Raithel Knowledge of dynamic polarizabilities is crucial in the development of magic optical traps for extending coherence times in the subfields of quantum information and precision metrology. In the latter subfield, there has been interest in making use of the rubidium 5D states. We report the first measurement of the dynamic scalar polarizability of the rubidium 5D3/2 state in a photoionizing optical lattice at 1064 nm using two-photon laser spectroscopy. We simultaneously probe the light shifts on both the D1 line and the 5P1/2 to 5D3/2 transitions, a method that calibrates the lattice field intensity the atoms see. This lattice is ultra-deep (~105 photon recoils) and is realized with a near-concentric field-enhancement cavity located within our vacuum chamber. We also report a measurement of the 5D3/2 photoionization cross section σ at 1064 nm by measuring the linewidths of the spectral peaks. No theoretical values have been established for either physical quantity to our knowledge thus far. |
Thursday, June 3, 2021 3:00PM - 3:12PM Live |
U05.00006: Deuteron to proton mass ratio by simultaneous measurement of the cyclotron frequencies of H2+ and D+ with H2+ in resolved rotational states Edmund G Myers, David J Fink A precise deuteron-proton mass ratio enables precision laser and terahertz spectroscopy of HD+ to be used to test QED calculations and obtain an improved electron-proton mass ratio. Combined with a measurement of the atomic mass of the deuteron against carbon it also leads to a more precise value for the atomic mass of the proton. An advantageous approach to obtaining the deuteron-proton mass ratio is to measure the cyclotron frequency ratio of H2+ to D+. This is because heavier ions are less subject to relativistic shifts to the cyclotron frequency, and higher precision can be obtained by measuring ions with similar mass-to-charge ratio and similar mass. Here we report measurements of the cyclotron frequency ratio of H2+ to D+ with sufficient resolution that, in certain cases, will allow the identification of the rotational as well as the vibrational state of the H2+ ion as it undergoes a sequence of ro-vibrational decays. This will enable us to precisely correct the measured H2+ masses for rotational energy, which was a limitation in our previous measurement. The increased resolution is achieved by using the technique of simultaneous measurement of the cyclotron frequencies of two ions in a coupled cyclotron orbit. |
Thursday, June 3, 2021 3:12PM - 3:24PM Live |
U05.00007: Circumventing detector backaction on a quantum cyclotron for a new measurement of electron and positron magnetic moments Xing Fan, Thomas G Myers, Benedict A Sukra, Geev Nahal, Gerald Gabrielse Measurement of the magnetic moment of the electron provides the most stringent test of the Standard Model. |
Thursday, June 3, 2021 3:24PM - 3:36PM Live |
U05.00008: Comagnetometry using Synchronous Spin-Exchange Optical Pumping Susan Sorensen, Zaynab Yardim, Daniel A Thrasher, Thad G Walker We present a spin-exchange pumped noble gas comagnetometer which utilizes two Xe isotopes and Rb atoms, all continuously polarized transverse to a pulsed bias field. The nuclear magnetic resonance conditions of both Xe species are simultaneously satisfied by frequency modulation of the pulse repetition rate, by modulation of the Rb polarization, or by a combination of the two. The Rb atoms, acting as an embedded magnetometer, detect the Xe precession. The demonstrated device achieves sub-µHz-scale rotation sensitivity, and suppresses sub-Hz magnetic field fluctuations by a factor of 2300. |
Thursday, June 3, 2021 3:36PM - 3:48PM Live |
U05.00009: Universal atom interferometry simulator for precision sensing Florian Fitzek, Jan-Niclas Siemß, Stefan Seckmeyer, Holger Ahlers, Ernst M Rasel, Klemens Hammerer, Naceur Gaaloul Quantum sensors based on light-pulse atom interferometers allow for a wide range of high-precision measure- |
Thursday, June 3, 2021 3:48PM - 4:00PM Live |
U05.00010: Search for a solar relaxion halo with the Global Network of Optical Magnetometers for Exotic physics (GNOME) Tatum Z Wilson, Rayshaun D Preston, Christopher A Palm, Christopher R Verga, Muhammad Saeed, Amy Saputo, Derek F Kimball The relaxion is a hypothetical ultralight boson proposed to solve the hierarchy problem [Graham, Kaplan, and Rajendran, Phys. Rev. Lett. 115, 221801 (2015)]. Relaxions may comprise the majority of dark matter, and could collect in a halo trapped by the gravitational potential of the Earth or Sun [Banerjee et al., Communications Phys. 3, 1 (2020)]. The relaxion field interacts with atomic spins and would generate an oscillating signal detectable with atomic magnetometers, such as those comprising the Global Network of Optical Magnetometers for Exotic physics [GNOME, see Afach et al., Physics of the Dark Universe 22, 162 (2018)]. We present preliminary results of a search for a solar relaxion halo using GNOME data. |
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