“…Alkali metal atoms have attracted much attention in the study of ultracold atoms and molecules because of their unique electronic structure. , Triatomic and tetratomic reaction systems composed of alkali metal atoms are the most studied systems in cold and ultracold reactions. − In particular, long-lived complexes are formed in these reactions, which also opens up the possibility of directly observing intermediates in the reactions. As the complex-forming mechanism plays a dominant role in these reactions, the SQM method has been widely employed in many studies to investigate the reaction dynamics under ultracold conditions.…”