A5040563024- Cold Atom Physics and Bose-Einstein Condensates
- Atomic and Molecular Physics
- Atomic and Subatomic Physics Research
- Advanced Chemical Physics Studies
- Advanced Frequency and Time Standards
- Spectroscopy and Laser Applications
- Laser-Matter Interactions and Applications
- Quantum optics and atomic interactions
- Nuclear physics research studies
- Laser Design and Applications
- Mass Spectrometry Techniques and Applications
- Quantum, superfluid, helium dynamics
- Radioactive Decay and Measurement Techniques
- Nuclear Physics and Applications
- Quantum Information and Cryptography
- Particle accelerators and beam dynamics
- Quantum Mechanics and Applications
- Ion-surface interactions and analysis
- Atmospheric Ozone and Climate
- Spectroscopy and Quantum Chemical Studies
- Mechanical and Optical Resonators
- Noncommutative and Quantum Gravity Theories
- Molecular Spectroscopy and Structure
- Particle physics theoretical and experimental studies
- Force Microscopy Techniques and Applications
University of Groningen
2014-2024
National Institute for Subatomic Physics
2019-2024
Tel Aviv University
2021
Vrije Universiteit Amsterdam
2021
Zorginstituut Nederland
2012-2013
Fritz Haber Institute of the Max Planck Society
2006-2011
Radboud University Nijmegen
2006
Rijksmuseum
2006
University of Illinois Chicago
1987
Abstract Molecules containing short-lived, radioactive nuclei are uniquely positioned to enable a wide range of scientific discoveries in the areas fundamental symmetries, astrophysics, nuclear structure, and chemistry. Recent advances ability create, cool, control complex molecules down quantum level, along with recent upcoming species production at several facilities around world, create compelling opportunity coordinate combine these efforts bring precision measurement extreme nuclei. In...
Molecular scattering behavior has generally proven difficult to study at low collision energies. We formed a molecular beam of OH radicals with narrow velocity distribution and tunable absolute by passing the through Stark decelerator. The transition probabilities for inelastic Xe atoms were measured as function energy in range 50 400 wavenumbers, an overall resolution about 13 wavenumbers. cross-sections near energetic thresholds was accurately measured, excellent agreement obtained derived...
The parameter $W_\mathrm{a}$, which characterizes nuclear spin-dependent parity violation effects within the effective molecular spin-rotational Hamiltonian, was computed for electronic ground state of radium fluoride (RaF) and found to be one largest absolute values predicted so far. These calculations were performed with complex generalised Hartree-Fock method a two-component (quasi-relativistic) zeroth-order regular approximation framework. Peculiarities structure RaF lead highly diagonal...
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...
Optical pumping by blackbody radiation is a feature shared all polar molecules and fundamentally limits the time that these can be kept in single quantum state trap. To demonstrate quantify this, we have monitored optical of electrostatically trapped OH OD radicals room-temperature radiation. Transfer to rotationally excited states at 295 K 1/e trapping for X(2)Pi(3/2), v" =0, J"=3/2(f) 2.8 7.1 s, respectively.
Static electric dipole moments of nondegenerate systems probe mass scales for physics beyond the Standard Model well those reached directly at high energy colliders. Discrimination between different models, however, requires complementary searches in atomic-molecular-and-optical, nuclear and particle physics. In this report, we discuss current status prospects near future a compelling suite such experiments, along with developments needed encompassing theoretical framework.
We present a combined experimental and theoretical study on the radiative lifetime of CO in (3)Pi(1,2), v=0 state. molecules beam are prepared selected rotational levels this metastable state, Stark-decelerated, electrostatically trapped. From phosphorescence decay trap, is measured to be 2.63+/-0.03 ms for (3)Pi(1), v=0, J=1 level. spin-orbit coupling between (3)Pi A (1)Pi states 20% longer 3.16 calculated It concluded that other contributes observed rate CO.
We report on the Stark deceleration and electrostatic trapping of $^{14}\text{N}\text{H}$ $(a^{1}\ensuremath{\Delta})$ radicals. In trap, molecules are excited spin-forbidden $A^{3}\ensuremath{\Pi}\ensuremath{\leftarrow}a^{1}\ensuremath{\Delta}$ transition detected via their subsequent fluorescence to $X{^{3}\ensuremath{\Sigma}}^{\ensuremath{-}}$ ground state. The $1∕e$ time is $1.4\ifmmode\pm\else\textpm\fi{}0.1\text{ }\text{s}$, from which a lower limit 2.7 s for radiative lifetime...
We present experiments on decelerating and trapping ammonia molecules using a combination of Stark decelerator traveling wave decelerator. In the decelerator, moving potential is created by series ring-shaped electrodes to which oscillating high voltages (HV) are applied. By lowering frequency applied voltages, confined in trap decelerated brought standstill. As true 3D well, this kind deceleration has practically no losses, resulting great improvement usual techniques. The necessary...
We have investigated the response of superhydrogenated gas-phase coronene cations upon soft x-ray absorption. Carbon (1s)⟶π^{⋆} transitions were resonantly excited at hν=285 eV. The resulting core hole is then filled in an Auger decay process, with excess energy being released form electron. Predominantly highly dications are thus formed, which cool down by hydrogen emission. In systems, additional H atoms act as a buffer, quenching loss native and molecular fragmentation. Dissociation...
A compact detector for space-time metric and curvature is highly desirable. Here we show that quantum spatial superpositions of mesoscopic objects, the type which would in principle become possible with a combination state art techniques taking into account known sources decoherence, could be exploited to create such detector. By using Stern-Gerlach (SG) interferometry masses much larger than atoms, where interferometric signal extracted by measuring spins, accelerations as low...
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...
We demonstrate a novel method to determine the longitudinal phase-space distribution of cryogenic buffer gas beam barium-fluoride molecules based on two-step laser excitation scheme. The spatial resolution is achieved by transversely aligned that drives from ground state $X^2\Sigma^+$ $A^2\Pi_{1/2}$ around 860 nm, while velocity obtained counter-propagating with respect molecular and Doppler shifted $D^2\Sigma^+$ transition 797 nm. Molecules in $D$-state are detected virtually...
Abstract Recently, we have demonstrated a method to record the longitudinal phase-space distribution of pulsed cryogenic buffer gas cooled beam barium fluoride molecules with high resolution. In this paper, use determine influence various source parameters. Besides expected dependence on temperature and pressure, forward velocity is strongly correlated time they exit cell, revealing dynamics inside cell. Three observations are particularly noteworthy: (1) The increases rapidly as function...
We report on the production of a pulsed molecular beam metastable NH (a 1 ∆) radicals and present first results Stark deceleration ∆, J = 2, M Ω -4) from 550 m/s to 330 m/s.The decelerated molecules are excited spin-forbidden A 3 Π ← ∆ transition, detected via their subsequent spontaneous fluorescence X Σ -, v" 0 ground-state.These experiments demonstrate feasibility our recently proposed scheme [Phys.Rev. 64 ( 2001) 041401] accumulate ground-state in magnetic trap.
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...
High-precision tests of fundamental symmetries are looking for the parity- ($\mathcal{P}$), time-reversal- ($\mathcal{T}$) violating electric dipole moment electron (eEDM) as proof physics beyond Standard Model. Particularly, in polyatomic molecules, complex vibrational and rotational structure gives possibility to reach high enhancement $\mathcal{P},\mathcal{T}$-odd effects moderate fields, with increasing statistical sensitivity by using laser cooling. In this work, we calculate molecular...
To help prepare students to address future challenges in Science, Technology, Engineering, and Mathematics (STEM), they need develop 21st-century skills. These skills are mediated by their beliefs about the nature of scientific knowledge practices, or epistemological beliefs. One approach shown support students’ development these is problem-based instruction (PBI), which encourages collaborative self-directed learning while working on open-ended problems. We used a mixed-method qualitative...
Abstract An electrostatic hexapole lens is used to manipulate the transverse properties of a beam barium fluoride molecules from cryogenic buffer gas source. The spatial distribution measured by recording state-selective laser-induced fluorescence on an emccd camera, providing insight into intensity and position spread molecular beam. Although high mass unfavorable Stark shift pose considerable challenge, number in low-field seeking component N = 1 state that pass 4 mm diameter aperture 712...