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 E02: Focus Session: Molecular Spectroscopy for Fundamental PhysicsFocus Live
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Chair: Thad Walker, Wisconsin |
Tuesday, June 1, 2021 2:00PM - 2:30PM Live |
E02.00001: Fundamental physics with molecular hydrogen ions Invited Speaker: Stephan Schiller Molecular hydrogen ions (MHI) are three-body quantum systems composed of two simple nuclei and one electron. Compared to the hydrogen atom family, MHIs provide new opportunities for fundamental physics because their internal energy depends not only on the electron-nucleus but also on the nucleus-nucleus interaction and on the nuclear masses. The relative simplicity of MHIs allows successful predictions by ab initio theory, that as of today has reached a precision approaching that of the hydrogen atom theory. |
Tuesday, June 1, 2021 2:30PM - 3:00PM Live |
E02.00002: Radioactive molecules for fundamental physics Invited Speaker: Ronald Garcia Molecules containing radioactive nuclei, with extreme proton-to-neutron ratios, can be artificially created to study a wide range of physical phenomena. Precision measurements of these systems can offer unique insights into the properties of the atomic nucleus, and the fundamental particles and forces of nature. In this talk, I will present recent highlights and future perspectives for the studies of these exotic species. |
Tuesday, June 1, 2021 3:00PM - 3:12PM Live |
E02.00003: Precision laser spectroscopy of strontium dimers Kon H Leung, Emily Tiberi, Brandon Iritani, Tanya Zelevinsky Laser spectroscopy of molecules offers the intriguing prospect of constraining mass-dependent forces at the nanometer length scale, where current state-of-the-art limits are held by neutron scattering experiments. In this context, homonuclear alkaline-earth dimers are an attractive species, possessing naturally narrow transitions in the form of molecular subradiance, infrared inactive vibrational ground states, and spin-forbidden triplet electronic states. In addition, the 1Σ ground potentials of alkaline-earth dimers are well amenable to quantum chemistry modeling. Recently we have mapped out all 63 vibrational states with J=0 and J=2 belonging to X1Σg+ in 88Sr2, and we compare the binding energies to ab initio calculations. We demonstrate how light shifts induced by the optical lattice trap on a vibrational Raman clock transition can be used to accurately determine molecular polarizability ratios and transition strengths. We also discuss ongoing efforts toward characterizing the instability and systematic shifts of the molecular clock. |
Tuesday, June 1, 2021 3:12PM - 3:24PM Live |
E02.00004: Rotational Cooling TlF molecules for the CeNTREX nuclear Schiff moment search Olivier O Grasdijk, Mick Aitken, David P DeMille, Jakob Kastelic, David M Kawall, Steve K Lamoreaux, Oskari Timgren, Konrad Wenz, Tanya Zelevinsky, Tristan Winick The aim of CeNTREX (Cold molecule Nuclear Time-Reversal Experiment) is to search for time-reversal symmetry violation in the thallium nucleus by exploiting the Schiff moment of 205TlF in the polar molecule thallium fluoride (TlF). A cold beam of TlF with a rotational temperature of 7 K is produced with a cryogenic buffer gas beam source. The CeNTREX beamline will span some 7 meters, and requires rotational cooling and subsequent collimation with an electrostatic quadrupole lens to reach sufficient sensitivity to the Schiff moment. The rotational cooling procedure transfers a majority of the molecular population into a single rotational and hyperfine sublevel of the ground state manifold, using a single ultraviolet laser and a pair of microwave beams. Here we report on the procedure and current status of rotational cooling in CeNTREX. |
Tuesday, June 1, 2021 3:24PM - 3:36PM Live |
E02.00005: Characterization of the A2Π1/2(0,0,0) and X2Σ+(0,0,0) states of 171YbOH and 173YbOH Nickolas Pilgram, Timothy Steimle, Arian Jadbabaie, Yi Zeng, Nicholas Hutzler The odd isotopologues of ytterbium monohydroxide, 171,173YbOH, have been identied as promising molecules in which to measure parity (P) and time reversal (T) violating physics. We report on the characterization of the A2Π1/2(0,0,0)-X2Σ+(0,0,0) band near 577 nm for 171,173YbOH, a prerequisite to searches for P and T-violating physics with these molecules. Both laser-induced fuorescence (LIF) excitation spectra of a supersonic molecular beam sample and absorption spectra of a cryogenic buffer-gas cooled sample were recorded. Additionally, a novel spectroscopic technique based on laser-enhanced chemical synthesis is demonstrated and utilized in the absorption measurements. This technique was critical as it enabled the disentangling of the congested isotopologue structure. An effective Hamiltonian model is used to extract the fine and hyperfine parameters for the A2Π1/2(0,0,0) and X2Σ+(0,0,0) states. The determined X2Σ+(0,0,0) hyperfine parameters are consistent with recently predicted values1. Our analysis provides experimental confirmation of the computational methods used to compute the P,T-violating coupling constants, Wd and WM, theoretical constants which correlate P,T-violating physics to P,T-violating energy shifts in the molecule. The mass and magnetic moment dependence of the fine and hyperfine parameters for all isotopologues for both the A2Π1/2(0,0,0) and X2Σ+(0,0,0) states for YbOH and isoelectronic YbF are discussed. |
Tuesday, June 1, 2021 3:36PM - 3:48PM Live |
E02.00006: Detection and Classification of Aerosolized Biowarfare Agent Surrogates by The Single-Particle Optical Trapping-Raman Spectroscopy System Yukai Ai, Haifa Alali, Chuji Wang, Yongle Pan, Gorden Videen The biowarfare agents (BWAs) are the biological materials used with the intention to cause diseases to humans, animals, and plants. Because of the potential threat, the detection of BWAs has become increasingly important. We built a single-particle optical-trapping Raman spectroscopy (OT-RS) system and applied it for the detection of BWAs. The system can levitate a single particle in air from minutes to hours and capture the time-resolved Raman spectra from the single particle. Simultaneously, an associated image system can provide the position, shape, and size of the trapped particle in real time. The trapped particle in air is free from the noise of the substrate, and the interference from fluorescence can be effectively quenched by the photo-bleaching process. Four different BWA surrogates: Bacillus globigii (BG), Yersinia rhodei (Yr), MS2, and Bacillus subtilis (BS) with some bioaerosol particles which are commonly presented in air were tested in the experiment. The single particle spectra show some similarities and distinguishable Raman peaks. We monitored the time evolution of the spectra for the trapped particle. The intensity change of some Raman bands indicates that some particle experienced a chemical or physical property change during the trapping period. The classification was processed by the principle component analyses (PCA). The PCA results suggest that the spectra of the single BWA surrogates can be identified and can also be clearly distinguished from the common bioaerosols in air. |
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