Direct observation of bimolecular reactions of ultracold KRb molecules

Hu, M. -G.; Liu, Y.; Grimes, D. D.; Lin, Y. -W.; Gheorghe, A. H.; Vexiau, R.; Bouloufa-Maafa, N.; Dulieu, O.; Rosenband, T.; Ni, K. -K.

doi:10.1126/science.aay9531

Direct observation of bimolecular reactions of ultracold KRb molecules

Journal Article · Wed Nov 27 23:00:00 EST 2019 · Science

DOI:https://doi.org/10.1126/science.aay9531· OSTI ID:1576076

; ; ; Lin, Y. -W.; ; Vexiau, R.; ; ; ;

Femtochemistry techniques have been instrumental in accessing the short time scales necessary to probe transient intermediates in chemical reactions. In this study, we took the contrasting approach of prolonging the lifetime of an intermediate by preparing reactant molecules in their lowest rovibronic quantum state at ultralow temperatures, thereby markedly reducing the number of exit channels accessible upon their mutual collision. Using ionization spectroscopy and velocity-map imaging of a trapped gas of potassium-rubidium (KRb) molecules at a temperature of 500 nanokelvin, we directly observed reactants, intermediates, and products of the reaction ⁴⁰ K ⁸⁷ Rb + ⁴⁰ K ⁸⁷ Rb → K ₂ Rb ₂ * → K ₂ + Rb ₂ . Beyond observation of a long-lived, energy-rich intermediate complex, this technique opens the door to further studies of quantum-state–resolved reaction dynamics in the ultracold regime.

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Sponsoring Organization:: USDOE Office of Science (SC), Nuclear Physics (NP) (SC-26); National Science Foundation (NSF)

Grant/Contract Number:: SC0019020

OSTI ID:: 1576076

Alternate ID(s):: OSTI ID: 1595080

Journal Information:: Science, Journal Name: Science Journal Issue: 6469 Vol. 366; ISSN 0036-8075

Publisher:: AAASCopyright Statement

Country of Publication:: United States

Language:: English

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Direct observation of bimolecular reactions of ultracold KRb molecules

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