M. H.  Palmer, Hoffmann, S. Vrønning, Jones, N. C., Coreno, M., de Simone, M., and Grazioli, C., ?The valence and Rydberg states of difluoromethane: A combined experimental vacuum ultraviolet spectrum absorption and theoretical study by ab initio configuration interaction and density functional computations?, Journal of Chemical Physics, vol. 148, 2018.