Chemical reactions of ultracold alkali-metal dimers in the lowest-energy ${}^3\Sigma$ state

Abstract

We show that the interaction of polar alkali dimers in the quintet spin state leads to the formation of a deeply bound reaction complex. The reaction complex can decompose adiabatically into homonuclear alkali dimers (for all molecules except KRb) and into alkali trimers (for all molecules). We show that there are no barriers for these chemical reactions. This means that all alkali dimers in the $a^3{\Sigma }^{+}$ state are chemically unstable at ultracold temperature, and the use of an optical lattice to segregate the molecules and suppress losses may be necessary. In addition, we calculate the minimum energy path for the chemical reactions of alkali hydrides. We find that the reaction of two molecules is accelerated by a strong attraction between the alkali atoms, leading to a barrierless process that produces hydrogen atoms with large kinetic energy. We discuss the unique features of the chemical reactions of ultracold alkali dimers in the $a^3{\Sigma }^{+}$ electronic state.

arXiv comment4 pages, 3 figures, 4 tables

References in corpus (19)

• A High Phase-Space-Density Gas of Polar Molecules
• Cold and Ultracold Molecules: Science, Technology, and Applications
• A toolbox for lattice spin models with polar molecules
• Controlling the quantum stereodynamics of ultracold bimolecular reactions
• Quo vadis, cold molecules? - Editorial review
• Calculation of accurate permanent dipole moments of the lowest ${}^{1,3}{\Sigma }^{+}$ states of heteronuclear alkali dimers using extended basis sets
• Long-lived dipolar molecules and Feshbach molecules in a 3D optical lattice
• Reactions of ultracold alkali metal dimers
• Calculations of static dipole polarizabilities of alkali dimers. Prospects for alignment of ultracold molecules
• Hyperfine, rotational, and vibrational structure of the triplet ground state of Rb molecules
• Controlling electronic spin relaxation of cold molecules with electric fields
• The X${}^1{\Sigma }^{+}$ and a${}^3{\Sigma }^{+}$ states of LiCs studied by Fourier-transform spectroscopy
• The coupling of the X${}^1{\Sigma }^{+}$ and a${}^3{\Sigma }^{+}$ states of KRb
• Three-body non-additive forces between spin-polarized alkali atoms
• Ab initio calculation of the KRb dipole moments
• Interatomic potentials, electric properties, and spectroscopy of the ground and excited states of the Rb_2 molecule: Ab initio calculations and effect of a non-resonant field
• Quantum reactive scattering of ultracold NH($X{}^3{\Sigma }^{-}$) radicals in a magnetic trap
• Spectroscopy of the a^3Σ_u^+ state and the coupling to the X^1Σ_g^+ state of K_2
• Product state control of bi-alkali chemical reactions

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• A Comparative Analysis of Non-relativistic and Relativistic Calculations of Electric Dipole Moments and Polarizabilities of Heteronuclear Alkali Dimers
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