A5082156334- Particle physics theoretical and experimental studies
- High-Energy Particle Collisions Research
- Quantum Chromodynamics and Particle Interactions
- Cold Atom Physics and Bose-Einstein Condensates
- Dark Matter and Cosmic Phenomena
- Advanced Materials Characterization Techniques
- Ion-surface interactions and analysis
- Electron and X-Ray Spectroscopy Techniques
- Atomic and Molecular Physics
- Quantum, superfluid, helium dynamics
- Cosmology and Gravitation Theories
- Advanced Chemical Physics Studies
- Distributed and Parallel Computing Systems
- Advanced Physical and Chemical Molecular Interactions
- Advanced Optical Sensing Technologies
- Integrated Circuits and Semiconductor Failure Analysis
- High-pressure geophysics and materials
- Quantum many-body systems
- Computational Physics and Python Applications
- Advanced Thermodynamics and Statistical Mechanics
- Advanced Frequency and Time Standards
- Methane Hydrates and Related Phenomena
- Astro and Planetary Science
- Image Processing Techniques and Applications
- Quantum optics and atomic interactions
Bryn Mawr College
2023-2024
Denison University
2020-2021
Centre National de la Recherche Scientifique
1995-1998
École Polytechnique
1995-1998
Laboratoire d'Informatique de l'École Polytechnique
1995-1998
Université Paris Cité
1997
University of Birmingham
1997
RWTH Aachen University
1997
University of California, Davis
1997
Laboratoire de Physique Nucléaire et de Hautes Énergies
1997
The electron affinity of thallium has been precisely measured using laser photodetachment threshold spectroscopy. relative cross section from the negative ion $^{205}\mathrm{Tl}^{\ensuremath{-}}$ was a tunable infrared over photon energy range 300--900 meV (4130--1380 nm). A pair closely spaced $s$-wave thresholds were observed due to transitions ground state $\mathrm{T}{\mathrm{l}}^{\ensuremath{-}}$ $(6{p}^{2}^{3}P_{0})$ two hyperfine levels neutral atom Tl $(6p^{2}P_{1/2},$ $F=0,1)$, which...
We demonstrated the accurate prediction of a quasibound spectrum negative ion using novel high-precision theoretical approach. used La$^-$ as test case due to recent experiment that measured energies 11 resonances in its photodetachment attributed transitions states [C. W. Walter et al., PRA, press (2020); arXiv:2010.01122]. identified all observed resonances, and predicted one more peak just outside range prior experiment. Following prediction, was at wavelength, validating identification....
The first direct experimental observation of an electric quadrupole ($E2$) absorption transition between bound states atomic negative ion has been made. was observed in the bismuth by resonant ($1+1$) photon detachment from ${\mathrm{Bi}}^{\ensuremath{-}}$ via $^{3}{P}_{2}\ensuremath{\rightarrow}^{3}{P}_{0}$ excitation. $E2$ properties were completely independently calculated using a hybrid theoretical approach to account for strong multilevel electron interactions and relativistic effects....
The radiative decay of excited states the negative ion rhodium, Rh$^-$, has been investigated experimentally and theoretically. experiments were conducted at Double ElectroStatic Ion Ring Experiment (DESIREE) facility Stockholm University using selective photodetachment from a stored beam to monitor time evolution state populations. lifetimes Rh$^-$ $^3F_{3}$ $^3F_{2}$ fine structure levels measured be 3.2(6)~s 21(4)~s, respectively. An additional, previously unreported, higher-lying bound...
A static electric field of a few V/cm shifts the energy levels ultracold Rydberg atoms in magneto-optical trap. For given principle quantum number, most are nearly degenerate at zero and fan out with increasing to form manifold. We excite near center manifold, where spacing is harmonic, allow them exchange via resonant dipole-dipole interactions. measure time evolution as spreads away from which reveals that system fails thermalize for long interaction times. computational model includes...
We simulate the dynamics of Rydberg atoms resonantly exchanging energy via two-, three-, and four-body dipole-dipole interactions in a one-dimensional array. Using simplified models realistic experimental system, we study initial-state survival probability, mean level spacing, spread entanglement, properties eigenstates. By exploring range disorders interaction strengths, find regions parameter space where three- either fail to thermalize or do so slowly. The interplay between stronger...
Lock-in detection is a widely used experimental technique in which weak signal measured by modulating it at particular frequency. Then, detecting an output that frequency, the desired can be isolated from much larger-amplitude noise. Here, we report on implementation and optimization of homemade laser barcode scanner based lock-in technique. Our setup comprised components are readily available undergraduate instructional laboratory. The successful transcription into digital was achieved,...
Synopsis The electron affinity of thallium, Tl, has been measured using tunable infrared laser photodetachment threshold spectroscopy. relative cross section for neutral atom production following from Tl − was with a crossed laser-ion beam apparatus over the photon energy range 300 - 900 meV. A single s -wave observed near 320 meV due to opening ground state phodetachment channel, yielding preliminary value thallium. present results are compared previous experimental and theoretical results.
We simulate the dynamics of Rydberg atoms resonantly exchanging energy via two-, three-, and four-body dipole-dipole interactions in a one-dimensional array. Using simplified model realistic experimental system, we study initial state survival probability, level spacing statistics, spread entanglement, properties eigenstates. By exploring range disorders interaction strengths, find regions parameter space where three- exhibit nonergodic behavior either fail to reach thermodynamic equilibrium...