  Photoionization of neutral atomic sulfur in the ground and metastable states
was studied experimentally at a photon energy resolution of 44 meV FWHM.
Relative cross section measurements were recorded by using tunable vacuum
ultraviolet (VUV) radiation in the energy range 9 -- 30 eV obtained from a
laser-produced plasma and the atomic species were generated by photolysis of
molecular precursors. Photoionization of this atom is characterized by multiple
Rydberg series of autoionizing resonances superimposed on a direct
photoionization continuum. A wealth of resonance features observed in the
experimental spectra are spectroscopically assigned and their energies and
quantum defects tabulated. The cross-section measurements are compared with
state-of-the-art theoretical cross-section calculations obtained from the Dirac
Coulomb R-matrix method. Resonances series in the spectra are identified and
compared indicating similar features in both the theoretical and experimental
spectra.
