Tijs Karman
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View article: Hyperfine van der Waals repulsion between open-shell polar molecules
Hyperfine van der Waals repulsion between open-shell polar molecules Open
We describe a novel type of interaction between open-shell polar molecules at sub-millikelvin temperatures. This hyperfine van der Waals interaction occurs between two molecules in two rotational states that differ by one quantum. Normally…
View article: Observation of Self-Bound Droplets of Ultracold Dipolar Molecules
Observation of Self-Bound Droplets of Ultracold Dipolar Molecules Open
Ultracold gases of dipolar molecules have long been envisioned as a platform for the realization of novel quantum phases. Recent advances in collisional shielding, protecting molecules from inelastic losses, have enabled the creation of de…
View article: Complete insensitivity to ab initio data -- A new perspective on modeling collision-induced absorption of noble gas atoms
Complete insensitivity to ab initio data -- A new perspective on modeling collision-induced absorption of noble gas atoms Open
In this study, we systematically investigate how the accuracy of CIA spectra depends on the quality of the ab initio data used. We evaluate quantitatively the impact of different quantum chemical methods and basis sets on spectral features…
View article: Dipolar Droplets of Strongly Interacting Molecules
Dipolar Droplets of Strongly Interacting Molecules Open
We simulate a molecular Bose-Einstein condensate in the strongly dipolar regime, observing the existence of self-bound droplets, as well as their splitting into multiple droplets by confinement-induced frustration. Our quantum Monte Carlo …
View article: Double Microwave Shielding
Double Microwave Shielding Open
We develop double microwave shielding, which has recently enabled evaporative cooling to the first Bose-Einstein condensate of polar molecules [Bigagli et al., Nature 631, 289 (2024)]. Two microwave fields of different frequency and polari…
View article: Dipolar droplets of strongly interacting molecules
Dipolar droplets of strongly interacting molecules Open
We simulate a molecular Bose-Einstein condensate in the strongly dipolar regime, observing the existence of self-bound droplets, as well as their splitting into multiple droplets by confinement-induced frustration. Our quantum Monte Carlo …
View article: State-to-State Molecular Reactions in the Ultracold Regime (Final Scientific Report)
State-to-State Molecular Reactions in the Ultracold Regime (Final Scientific Report) Open
We have achieved the proposed goal to experimentally probe the AB + CD and AB + C types of reactions with state-to-state resolution, which we also compared to advanced theoretical calculations to help elucidate the role of quantum mechanic…
View article: Data availability and requirements relevant for the Ariel space mission and other exoplanet atmosphere applications
Data availability and requirements relevant for the Ariel space mission and other exoplanet atmosphere applications Open
The goal of this white paper is to provide a snapshot of the data availability and data needs primarily for the Ariel space mission, but also for related atmospheric studies of exoplanets and brown dwarfs. It covers the following data-rela…
View article: Rotational-state dependence of interactions between polar molecules
Rotational-state dependence of interactions between polar molecules Open
The long-range electrostatic interactions between molecules depend strongly on their relative orientation, which manifests as a rotational state dependence. Interactions between molecules in the same rotational quantum state are well-known…
View article: Scheme for Deterministic Loading of Laser-Cooled Molecules into Optical Tweezers
Scheme for Deterministic Loading of Laser-Cooled Molecules into Optical Tweezers Open
We propose to repeatedly load laser-cooled molecules into optical tweezers, and transfer them to storage states that are rotationally excited by two additional quanta. Collisional loss of molecules in these storage states is suppressed, an…
View article: Data availability and requirements relevant for the <i>Ariel</i> space mission and other exoplanet atmosphere applications
Data availability and requirements relevant for the <i>Ariel</i> space mission and other exoplanet atmosphere applications Open
The goal of this white paper is to provide a snapshot of the data availability and data needs primarily for the Ariel space mission, but also for related atmospheric studies of exoplanets and cool stars. It covers the following data-relate…
View article: Observation of Bose-Einstein Condensation of Dipolar Molecules
Observation of Bose-Einstein Condensation of Dipolar Molecules Open
Ensembles of particles governed by quantum mechanical laws exhibit fascinating emergent behavior. Atomic quantum gases, liquid helium, and electrons in quantum materials all show distinct properties due to their composition and interaction…
View article: <i>Ab initio</i> calculation of the spectrum of Feshbach resonances in NaLi <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mo>+</mml:mo></mml:math> Na collisions
<i>Ab initio</i> calculation of the spectrum of Feshbach resonances in NaLi Na collisions Open
\n Contains fulltext :\n 296270.pdf (Publisher’s version ) (Open Access)\n
View article: Collisionally Stable Gas of Bosonic Dipolar Ground State Molecules
Collisionally Stable Gas of Bosonic Dipolar Ground State Molecules Open
Stable ultracold ensembles of dipolar molecules hold great promise for many-body quantum physics, but high inelastic loss rates have been a long-standing challenge. Recently, it was shown that gases of fermionic molecules can be effectivel…
View article: Ab initio calculation of the spectrum of Feshbach resonances in NaLi + Na collisions
Ab initio calculation of the spectrum of Feshbach resonances in NaLi + Na collisions Open
We present a combined experimental and theoretical study of the spectrum of magnetically tunable Feshbach resonances in NaLi $(a^3Σ^+)$ $+$ Na collisions. In the accompanying paper, we observe experimentally 8 and 17 resonances occur betwe…
View article: Quantum state–resolved molecular dipolar collisions over four decades of energy
Quantum state–resolved molecular dipolar collisions over four decades of energy Open
Collisions between cold polar molecules represent a fascinating research frontier but have proven hard to probe experimentally. We report measurements of inelastic cross sections for collisions between nitric oxide (NO) and deuterated ammo…
View article: Spectrum of Feshbach resonances in NaLi $+$ Na collisions
Spectrum of Feshbach resonances in NaLi $+$ Na collisions Open
Collisional resonances of molecules can offer a deeper understanding of interaction potentials and collision complexes, and allow control of chemical reactions. Here, we experimentally map out the spectrum of Feshbach resonances in collisi…
View article: Resonances in Non-universal Dipolar Collisions
Resonances in Non-universal Dipolar Collisions Open
Scattering resonances due to the dipole-dipole interaction between ultracold molecules, induced by static or microwave fields, are studied theoretically. We develop a method for coupled-channel calculations that can efficiently impose many…
View article: Quantum state resolved molecular dipolar collisions over four decades of energy
Quantum state resolved molecular dipolar collisions over four decades of energy Open
Collisions between cold polar molecules represent a fascinating research frontier, but have proven hard to probe experimentally. We report measurements of inelastic cross sections for collisions between NO and ND 3 molecules at energies be…
View article: Field-linked resonances of polar molecules
Field-linked resonances of polar molecules Open
Scattering resonances are an essential tool for controlling the interactions of ultracold atoms and molecules. However, conventional Feshbach scattering resonances 1 , which have been extensively studied in various platforms 1–7 , are not …
View article: Quantum state resolved molecular dipolar collisions over four decades of energy - online data
Quantum state resolved molecular dipolar collisions over four decades of energy - online data Open
Data for submission of "Quantum state resolved molecular dipolar collisions over four decades of energy" Authors: Guoqiang Tang1, Matthieu Besemer1, Stach Kuijpers1, Gerrit C. Groenenboom1, Ad van der Avoird1, Tijs Karman1**, Sebastiaan Y.…
View article: Quantum state resolved molecular dipolar collisions over four decades of energy - online data
Quantum state resolved molecular dipolar collisions over four decades of energy - online data Open
Data for submission of "Quantum state resolved molecular dipolar collisions over four decades of energy" Authors: Guoqiang Tang1, Matthieu Besemer1, Stach Kuijpers1, Gerrit C. Groenenboom1, Ad van der Avoird1, Tijs Karman1**, Sebastiaan Y.…
View article: Symmetry Breaking in Sticky Collisions between Ultracold Molecules
Symmetry Breaking in Sticky Collisions between Ultracold Molecules Open
Ultracold molecules undergo "sticky collisions" that result in loss even for chemically nonreactive molecules. Sticking times can be enhanced by orders of magnitude by interactions that lead to nonconservation of nuclear spin or total angu…
View article: Resonances in non-universal dipolar collisions
Resonances in non-universal dipolar collisions Open
Scattering resonances due to the dipole-dipole interaction between ultracold molecules, induced by static or microwave fields, are studied theoretically. We develop a method for coupled-channel calculations that can efficiently impose many…
View article: Field-linked resonances of polar molecules
Field-linked resonances of polar molecules Open
Scattering resonances are an essential tool for controlling interactions of ultracold atoms and molecules. However, conventional Feshbach scattering resonances, which have been extensively studied in various platforms, are not expected to …
View article: Correlated rotational excitations in NO–CO inelastic collisions
Correlated rotational excitations in NO–CO inelastic collisions Open
We present a joint experimental and theoretical study of rotationally inelastic collisions between NO (X2Π1/2, ν = 0, j = 1/2, f) radicals and CO (X1Σ+, ν = 0, j = 0) molecules at a collision energy of 220 cm−1. State-to-state scattering i…
View article: Symmetry breaking in sticky collisions between ultracold molecules
Symmetry breaking in sticky collisions between ultracold molecules Open
Ultracold molecules undergo "sticky collisions" that result in loss even for chemically nonreactive molecules. Sticking times can be enhanced by orders of magnitude by interactions that lead to non-conservation of nuclear spin or total ang…