Excited states of alkali atoms in liquid He-4 from density functional calculations

Calculations are presented, based on a Density Functional approach, of the first excited states (1=1) of alkali metal atoms (Cs and Na) in liquid He-4. We find large departures from the spherical bubble in the liquid He-4 structure when the alkali atom in excited. The shifts from the free atom values of the excitation and emission transition lines are calculated and compared with the experimental results. According to our calculations, the so far unseen radiative deexcitation transition for lights alkalis in He-4 may lie in an unexplored infrared region of the spectrum.