Rotation of cold molecular ions inside a Bose-Einstein condensate Midya, Bikashkali Tomza, Michał Schmidt, Richard Lemeshko, Mikhail ; https://orcid.org/0000-0002-6990-7802 We use recently developed angulon theory [R. Schmidt and M. Lemeshko, Phys. Rev. Lett. 114, 203001 (2015)PRLTAO0031-900710.1103/PhysRevLett.114.203001] to study the rotational spectrum of a cyanide molecular anion immersed into Bose-Einstein condensates of rubidium and strontium. Based on ab initio potential energy surfaces, we provide a detailed study of the rotational Lamb shift and many-body-induced fine structure which arise due to dressing of molecular rotation by a field of phonon excitations. We demonstrate that the magnitude of these effects is large enough in order to be observed in modern experiments on cold molecular ions. Furthermore, we introduce a novel method to construct pseudopotentials starting from the ab initio potential energy surfaces, which provides a means to obtain effective coupling constants for low-energy polaron models. American Physical Society 2016 info:eu-repo/semantics/article doc-type:article text http://purl.org/coar/resource_type/c_2df8fbb1 https://research-explorer.ista.ac.at/record/1286 Midya B, Tomza M, Schmidt R, Lemeshko M. Rotation of cold molecular ions inside a Bose-Einstein condensate. <i>Physical Review A - Atomic, Molecular, and Optical Physics</i>. 2016;94(4). doi:<a href="https://doi.org/10.1103/PhysRevA.94.041601">10.1103/PhysRevA.94.041601</a> eng info:eu-repo/semantics/altIdentifier/doi/10.1103/PhysRevA.94.041601 info:eu-repo/semantics/altIdentifier/wos/000385618500001 info:eu-repo/semantics/altIdentifier/arxiv/1607.06092 info:eu-repo/semantics/openAccess