The precision calculations of Na polarizabilities and Na−affinities

Using a set of high quality orbital basis, we carried out precision calculations of the static polarizabilities of Na at ground state and the affinities of ground Na−, where the accurate experimental measurements are available. By taken into account the electron correlations adequately, our calculation results are in consistent with precision experimental results within about 0.1%. Using this high quality basis, we would be able to calculate the frequency-dependent polarizabilities with high accuracy, which is very important for ac Stark coefficients calculations used in atomic frequency standard.