ИСТИНА

Molecules in the ultracold regime have continued to attract the attention of scientists as they offer unique insights for instance how quantum states affect chemical reactions. As of now alkali-metal dimers are a well-known candidate for laser cooling and synthesis, with most having been synthesized and cooled. For many of these molecules, the focus has now shifted to atom+dimer collisions and, thus, to trimers. In this work, the potential energy surfaces (PESs) as well as transition dipole moments (TDMs) of low-lying doublet states of the Rb3 molecule were obtained for the T-geometry within the framework of ab initio calculations performed in the C2v symmetry. The Rb atoms were described using a core polarization potential and effective core potential approach. The molecular orbitals were optimized within a multi-reference self-consistent field calculation, using an active space consisting of 20 orbitals. In the following configuration interaction calculations all sub-valence electrons, save the three valence electrons, were kept on doubly occupied orbitals. This work has been supported by RSF grant №22-73-00095, https://rscf.ru/project/22-73-00095/.