Energetics and control of ultracold isotope-exchange reactions between heteronuclear dimers in external fields

Abstract

We show that isotope-exchange reactions between ground-state alkali-metal, alkaline-earth-metal, and lanthanide heteronuclear dimers consisting of two isotopes of the same atom are exothermic with an energy change in the range of 1-8000MHz thus resulting in cold or ultracold products. For these chemical reactions there are only one rovibrational and at most several hyperfine possible product states. The number and energetics of open and closed reactive channels can be controlled by the laser and magnetic fields. We suggest a laser-induced isotope- and state-selective Stark shift control to tune the exothermic isotope-exchange reactions to become endothermic thus providing the ground for testing models of the chemical reactivity. The present proposal opens the way for studying the state-to-state dynamics of ultracold chemical reactions beyond the universal limit with a meaningful control over the quantum states of both reactants and products.

5 pages, 1 figure, 1 table

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• A laser cooling scheme for precision measurements using barium monofluoride (137Ba19F) molecules
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• Ultracold nonreactive molecules in an optical lattice: connecting chemistry to many-body physics
• Collisional losses of ultracold molecules due to intermediate complex formation
• Two interacting ultracold molecules in a one-dimensional harmonic trap
• Ab Initio Study of Chemical Reactions of Cold SrF and CaF Molecules with Alkali-Metal and Alkaline-Earth-Metal Atoms
• Microscopic derivation of multi-channel Hubbard models for ultracold nonreactive molecules in an optical lattice
• Laser cooling of barium monofluoride molecules using synthesized optical spectra
• Interactions of benzene, naphthalene, and azulene with alkali-metal and alkaline-earth-metal atoms for ultracold studies
• Radiative Decay Rate and Branching Fractions of MgF
• Nonadiabatic Phase Transition with Broken Chiral Symmetry
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• Magnetic properties and quench dynamics of two interacting ultracold molecules in a trap
• Isotopologue-selective laser cooling of molecules
• Determination of the exchange interaction energy from the polarization expansion of the wave function
• Ab initio electronic structure of the Sr${}_2^{+}$ molecular ion
• Product-state distribution after isotopic substitution in ultracold atom-molecule collisions
• Automated Graph-Based Detection of Quantum Control Schemes: Application to Molecular Laser Cooling