Molecular collisions: From near-cold to ultra-cold

Liu, Yang; Luo, Le

doi:10.1007/s11467-020-1037-6

Cited by 17 publications

(31 citation statements)

References 316 publications

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“…Recent reviews have treated the creation of ultracold molecules and the general understanding of cold collisions. − Here, we focus specifically on sticky collisions. We give an overview of recent experimental and theoretical results and discuss possible solutions for the large disagreement between them.…”

Section: Introductionmentioning

confidence: 99%

Ultracold Sticky Collisions: Theoretical and Experimental Status

et al. 2023

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Collisional complexes, which are formed as intermediate states in molecular collisions, are typically short-lived and decay within picoseconds. However, in ultracold collisions involving bialkali molecules, complexes can live for milliseconds, completely changing the collision dynamics. This can lead to unexpected two-body loss in samples of nonreactive molecules. During the past decade, such "sticky" collisions have been a major hindrance in the preparation of dense and stable molecular samples, especially in the quantum-degenerate regime. Currently, the behavior of the complexes is not fully understood. For example, in some cases, their lifetime has been measured to be many orders of magnitude longer than recent models predict. This is not only an intriguing problem in itself but also practically relevant, since understanding molecular complexes may help to mitigate their detrimental effects. Here, we review the recent experimental and theoretical progress in this field. We treat the case of molecule−molecule as well as molecule−atom collisions.

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Section: Introductionmentioning

confidence: 99%

Ultracold Sticky Collisions: Theoretical and Experimental Status

et al. 2023

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“…This information can help researchers to design and interpret experiments and can guide the development of new computational models for simulating the dynamics of these interactions. − Alkaline diatomic molecules interacting with alkaline atoms have attracted considerable attention in the context of experiments involving cold and ultracold molecules. It offers many new research opportunities and challenges in many fields like controlled chemistry, ultracold chemical physics, and quantum simulations. − Moreover, atom-molecule interaction potential data may help experimental application on the magnetic tuning of Feshbach resonances , and three-body recombination …”

Section: Introductionmentioning

confidence: 99%

Potential Energy Surfaces and Arrangement Effects of RbNa₂ Complex

et al. 2023

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Ab initio calculations of alkaline diatomic molecule interactions with alkaline atoms provide detailed information about their electronic structure, vibrational frequencies, and spectroscopic properties, which are difficult to measure experimentally. This knowledge can aid in designing and interpreting experiments and guide the development of computational models and advanced dynamical calculation. Using the quantum chemistry ab initio methods based on multi-reference configuration interaction with Davidson correction (MCSCF/MRCI + Q), atomic effective core potentials, core-polarization potentials, and the interactions between the sodium atom and the NaRb diatomic molecule are investigated. To describe the potential energy surfaces of the RbNa2 system, we introduce two geometries described in the Z-matrix coordinates (R e, R, θ). Potential energy surfaces of the ground state 12A′ and the first excited state 22A′ were calculated for different approach directions of the sodium atom to the NaRb molecule and two geometries were considered. The first geometry is where the Na atom approaches the Rb atom of the RbNa dimer, and the second one is when it approaches the Na atom of the RbNa dimer. Global minima of the ground and first excited states and conical intersections between these states are determined for both geometries. The RbNa dimer in interaction with the sodium atom is found to be strongly attractive in its first excited state, which may be important for the experimenters particularly in the field of cold alkali polar dimers. Thereafter, the potential energy curves correlated to the lowest-lying dissociation limits are calculated in the linear form for the two geometrical cases (angle θ at 180°) and the atomic arrangement effect is observed.

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“…Second, it enables decelerating heavy paramagnetic molecules to standstill due to its large and highly stable phase space acceptance. These advantages have important implications for a broad range of applications, including precision measurements 1 and cold collision studies 55,56 . Specifically, in the search of eEDM, the sensitivity scales with the mass of the candidate molecule and the third power of the molecular number 57 .…”

Section: Introductionmentioning

confidence: 99%

Ring-shaped traveling wave Zeeman decelerator for both light and heavy molecules

Ji¹,

Liu²,

Liu³

et al. 2023

Preprint

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Taming more species of molecules with large density is a long-standing goal in molecular science. Heavy molecule (> 100 amu) is of particular interest for precision measurements. However, decelerating a fast-moving beam of heavy molecules to rest remains challenging for Zeeman deceleration. Additionally, the traditional approach of pulsed Zeeman decelerator suffers from serious molecular loss during deceleration, significantly limiting its potential applications. Herein, we present a ring-shaped traveling wave Zeeman decelerator (RTWZD) featured with true three-dimensional smoothly-moving magnetic potential wells that directly solve the above intractable problems. With this approach, not only the density of the molecule can be greatly increased but also the range of molecular species for Zeeman deceleration can be extended from light to heavy. The performance of the RTWZD is characterized with both the theoretical analysis and the numerical calculation, where a group of atoms and molecules such as 7Li, 32O2, 88Sr19F and 174Yb19F are employed as testers. Losses in the traditional Zeeman decelerator can be avoided, yielding more than two orders of magnitude improvement in molecular density. These characteristics of the RTWZD make it an ideal toolbox to produce cold and dense atomic/molecular samples, enabling promising prospects for cold collision, sympathetic cooling, and precision measurement.

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Molecular collisions: From near-cold to ultra-cold

Cited by 17 publications

References 316 publications

Ultracold Sticky Collisions: Theoretical and Experimental Status

Ultracold Sticky Collisions: Theoretical and Experimental Status

Potential Energy Surfaces and Arrangement Effects of RbNa₂ Complex

Ring-shaped traveling wave Zeeman decelerator for both light and heavy molecules

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Molecular collisions: From near-cold to ultra-cold

Cited by 17 publications

References 316 publications

Ultracold Sticky Collisions: Theoretical and Experimental Status

Ultracold Sticky Collisions: Theoretical and Experimental Status

Potential Energy Surfaces and Arrangement Effects of RbNa2 Complex

Ring-shaped traveling wave Zeeman decelerator for both light and heavy molecules

Contact Info

Product

Resources

About

Potential Energy Surfaces and Arrangement Effects of RbNa₂ Complex