Magnetic Feshbach resonances in collisions of $^{23}$Na$^{40}$K with $^{40}$K

TL;DR

This study reports over 80 magnetic Feshbach resonances in ultracold NaK-K collisions, identifying their quantum states and suggesting they are due to long-range triatomic states, which are common in alkali-metal systems.

Contribution

The paper provides the first detailed assignment of quantum numbers to Feshbach resonances in NaK-K collisions and demonstrates their origin from long-range states.

Findings

Over 80 resonances observed and characterized.

Resonances linked to long-range triatomic states.

Resonances are not part of chaotic short-range states.

Abstract

We present measurements of more than 80 magnetic Feshbach resonances in collisions of ultracold $^{23}$Na$^{40}$K with $^{40}$K. We assign quantum numbers to a group of low-field resonances and show that they are due to long-range states of the triatomic complex in which the quantum numbers of the separated atom and molecule are approximately preserved. The resonant states are not members of chaotic bath of short-range states. Similar resonances are expected to be a common feature of alkali-metal diatom + atom systems.