A5044983949- Cold Atom Physics and Bose-Einstein Condensates
- Atomic and Molecular Physics
- Advanced Frequency and Time Standards
- Advanced Chemical Physics Studies
- Spectroscopy and Laser Applications
- Atomic and Subatomic Physics Research
- Quantum Information and Cryptography
- Quantum optics and atomic interactions
- Electrochemical Analysis and Applications
- Strong Light-Matter Interactions
- Orbital Angular Momentum in Optics
- Force Microscopy Techniques and Applications
- Laser Design and Applications
- Analytical Chemistry and Sensors
- Solid-state spectroscopy and crystallography
National Institute of Standards and Technology
2023-2024
University of Colorado Boulder
2023-2024
National Institute for Subatomic Physics
2019-2022
University of Groningen
2018-2022
Tel Aviv University
2021
Vrije Universiteit Amsterdam
2021
We investigate the merits of a measurement permanent electric dipole moment electron ($e$EDM) with barium monofluoride molecules, thereby searching for phenomena CP violation beyond those incorporated in Standard Model particle physics. Although BaF molecule has smaller enhancement factor terms effective field than other molecules used current studies (YbF, ThO and ThF$^+$), we show that competitive is possible by combining Stark-deceleration, laser-cooling an intense primary cold source...
The NL-eEDM collaboration is building an experimental setup to search for the permanent electric dipole moment of electron in a slow beam cold barium fluoride molecules [Eur. Phys. J. D, 72, 197 (2018)]. Knowledge molecular properties BaF thus needed plan measurements and particular determine optimal laser-cooling scheme. Accurate reliable theoretical predictions these require incorporation both high-order correlation relativistic effects calculations. In this work investigations ground...
Direct laser cooling of molecules has reached a phase-space density exceeding 10^{-6} in optical traps but with rather small molecular numbers. To progress toward quantum degeneracy, mechanism that combines sub-Doppler and magneto-optical trapping would facilitate near unity transfer ultracold from the trap (MOT) to conservative trap. Using unique energy level structure YO molecules, we demonstrate first blue-detuned MOT for is optimized both gray-molasses relatively strong forces. This...
We report on the electrostatic trapping of neutral SrF molecules. The molecules are captured from a cryogenic buffer-gas beam source into moving traps 4.5-m-long traveling-wave Stark decelerator. in X^{2}Σ^{+}(v=0,N=1) state brought to rest as velocity is gradually reduced 190 m/s zero. held for up 50 ms multiple electric trapped packets have volume (FWHM) 1 mm^{3} and spread 5(1) m/s, which corresponds temperature 60(20) mK. Our result demonstrates factor 3 increase molecular mass that has...
A supersonic beam source for SrF and BaF molecules is constructed by combining the expansion of carrier gas (a mixture 2% SF6 98% argon) from an Even–Lavie valve with laser ablation a barium/strontium metal target at repetition rate 10 Hz. Molecular beams narrow translational velocity spread are produced relative values Δv/v = 0.053(11) 0.054(9) BaF, respectively. The in our lower comparison results other fluoride sources. rotational temperature measured to be 3.5 K. produces 6 × 108 107 per...
We present an investigation of the performance relativistic multi-reference Fock-space coupled cluster (FSCC) method for predicting molecular hyperfine structure (HFS) constants, including a thorough computational study to estimate associated uncertainties. In particular, we considered $^{19}$F HFS constant in ground and excited states BaF. Due larger basis set dependence, uncertainties on state results (16-85%) were found be significantly than those constants ($\sim$2%). The ab initio...
Time resolved detection of laser induced fluorescence from pulsed excitation electronic states in barium monofluoride (BaF) molecules has been performed order to determine the lifetimes $A^2\Pi_{1/2}$ and $A^2\Pi_{3/2}$ states. The method permits control over experimental parameters such that systematic biases interpretation data can be controlled below $10^{-3}$ relative accuracy. statistically limited values for $A^2\Pi_{1/2}(\nu=0)$ $A^2\Pi_{3/2}(\nu=0)$ are 57.1(3) ns 47.9(7)~ns,...
The authors study collisions of directly laser-cooled YO molecules in an ultracold regime involving few partial waves. They observe loss enhancement with increasing temperature or a larger number participating observed rates are compared to theory, suggesting incomplete at short range and resonant enhancement. This collision is highly relevant for achieving degenerate gas polar molecules.
Efficient sub-Doppler laser cooling and optical trapping of YO molecules offer new opportunities to study collisional dynamics in the quantum regime. Confined a crossed dipole trap, we achieve highest phase-space density $2.5 \times 10^{-5}$ for bulk laser-cooled molecular sample. This sets stage YO-YO collisions microkelvin temperature regime, reveal state-dependent, single-partial-wave two-body loss rates. We determine partial-wave contributions specific rotational states (first excited...
A measurement of the magnitude electric dipole moment electron (eEDM) larger than that predicted by Standard Model (SM) particle physics is expected to have a huge impact on search for beyond SM. Polar diatomic molecules containing heavy elements experience enhanced sensitivity parity ($P$) and time-reversal ($T$)-violating phenomena, such as eEDM scalar-pseudoscalar (S-PS) interaction between nucleons electrons, are thus promising candidates measurements. The NL-\textit{e}EDM collaboration...
Direct laser cooling of molecules has reached a phase space density exceeding 10$^{-6}$ in optical traps, but with rather small molecular numbers. To progress towards quantum degeneracy, mechanism is needed that combines sub-Doppler and magneto-optical trapping (MOT) to facilitate near unity transfer ultracold from the MOT conservative trap. Using unique energy level structure YO molecules, we demonstrate first blue-detuned for optimized both gray-molasses relatively strong forces. This...