A team of researchers at the Max Planck Institute of Quantum Optics (MPQ) in Garching has for the first time observed evidence of a phenomenon that had previously only been suspected: a theory predicts that exotic bound states can arise when ultracold polar molecules collide.
source https://www.lifetechnology.com/blogs/life-technology-science-news/researchers-observe-exotic-bound-states-in-ultracold-polar-molecules-for-the-first-time