Investigation of intravalence, core-valence and core-core electron correlation effects in polonium atomic structure calculations

•A detailed investigation of the atomic structure of Po I is presented for the first time.•The influence of intravalence, core-valence and core-core electron correlation is discussed.•Spectroscopic designations has been fixed for some energy levels.•A new set of radiative data for 31 Po I lines between 175 and 987 nm is reported.

A detailed investigation of the atomic structure and radiative parameters involving the lowest states within the 6p4, 6p36d, 6p37s, 6p37p and 6p37d configurations of neutral polonium is reported in the present paper. Using different physical models based on the pseudo-relativistic Hartree-Fock approach, the influence of intravalence, core-valence and core-core electron correlation on the atomic parameters is discussed in detail. This work allowed us to fix the spectroscopic designation of some experimental level energy values and to provide for the first time a set of reliable oscillator strengths corresponding to 31 Po I spectral lines in the wavelength region from 175 to 987 nm.