Spectroscopy of Atoms in Liquid Helium Environment: A Theoretical Perspective

A CASPT2 study of the spectral shift of the resonance emission lines of Rb and Cs embedded in liquid He

“…The spectroscopic characteristics of atoms and molecules in He [1,2] environment has been the subject of intense investigations for decades and the subject is rich both in terms of theoretical understanding and experimental findings [3,4]. Foreign particles embedded inside the liquid create a cavity or bubble-like structure due to strong Pauli repulsion, the shape and size of which are determined by the nature of the impurity and the angular momentum of the excited state [3].…”