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

TL;DR

This paper demonstrates how external fields can control ultracold isotope-exchange reactions between heteronuclear dimers, enabling precise manipulation of reaction energetics and pathways for advanced quantum chemistry studies.

Contribution

It introduces a laser and magnetic field-based method to tune isotope-exchange reactions from exothermic to endothermic at ultracold temperatures, allowing detailed state-to-state reaction control.

Findings

Reactions are exothermic with energy changes of 1-8000 MHz.

Reaction channels can be controlled via laser and magnetic fields.

Proposes laser-induced Stark shift control for reaction tuning.

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 1-8000$\,$MHz 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.