Properties and long range interactions of the calcium atom

The properties of a number of states of calcium are determined from a large basis configuration interaction calculation. The main focus is on the polarizabilities of the low lying states (the 4 s 2 S e 1 , 4 s 3 d D e 1 , 3 , 4 s 4 p P o 1 , 3 , and 4 s 5 s S e 1 , 3 states) and the dispersion interactions of those states with the calcium ground state, the hydrogen atom, and the rare gases.