Quantum Reactive Scattering of Ultracold Atoms and Molecules: Universality and Chaotic Dynamics

Abstract

A fundamental question in the study of chemical reactions is how reactions proceed at a collision energy close to absolute zero. This question is no longer hypothetical: quantum degenerate gases of atoms and molecules can now be created at temperatures lower than a few tens of nanoKelvin. In this work we consider the benchmark ultracold reaction between, the most-celebrated ultracold molecule, KRb and K. For the first time we map out an accurate ab initio ground state potential energy surface of the KRbK complex in full dimensionality and report numerically exact quantum-mechanical reaction dynamics. The distribution of rotationally resolved rates is shown to be Poissonian. An analysis of the hyperspherical adiabatic potential curves explains this statistical character revealing a chaotic distribution for the short-range collision complex that plays a key role in governing the reaction outcome. We compare this with a lighter system with a smaller density of states (here the LiYbLi trimer) which displays random, and not chaotic, behavior.

References in corpus (18)

• Cold and Ultracold Molecules: Science, Technology, and Applications
• Quantum-State Controlled Chemical Reactions of Ultracold KRb Molecules
• Reactions of ultracold alkali metal dimers
• Quantum Chaos in Ultracold Collisions of Erbium
• Universal rate constants for reactive collisions of ultracold molecules
• Statistical Aspects of Ultracold Resonant Scattering
• Continuous probe of cold complex molecules with infrared frequency comb spectroscopy
• Emergence of chaotic scattering in ultracold Er and Dy
• Magnetically Controlled Exchange Process in an Ultracold Atom-Dimer Mixture
• Dispersion interactions and reactive collisions of ultracold polar molecules
• Interactions and dynamics in Li + Li_2 ultracold collisions
• Long-Lived Complexes, Ergodicity and Chaos in Ultracold Molecular Collisions
• Tuning bimolecular chemical reactions by electric fields
• Feshbach resonances in ultracold atom-molecule collisions
• Statistical product distributions for ultracold reactions in external fields
• The approach to chaos in ultracold atomic and molecular physics: statistics of near-threshold bound states for Li+CaH and Li+CaF
• Resonance reactions and enhancement of weak interactions in collisions of cold molecules
• Quantum chaos in ultracold collisions between Yb(${}^1$S${}_0$) and Yb(${}^3$P${}_2$)

Cited by in corpus (1)

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