  Density functional theory (DFT) is applied to atomic spectra under
perturbations of superfluid liquid helium. The atomic DFT of helium is used to
obtain the distribution of helium atoms around the impurity atom, and the
electronic DFT is applied to the excitations of the atom, averaging over the
ensemble of helium configurations. The shift and broadening of the D1 and D2
absorption lines are quite well reproduced by theory, suggesting that the DFT
may be useful for describing spectral perturbations in more complex
environments.
