Photoionization Study of Neutral Chlorine Atom.

Photoionization of neutral chlorine atom is investigated in this paper in the framework of the screening constant per unit nuclear charge (SCUNC) method. Resonance energies, quantum defects and effective charges of the 3s²3p⁴ (³P_2,1,0)ns and 3s²3p⁴ (³P_1,0)nd Rydberg series originating from both the ²P⁰_3/2 ground state and the ²P⁰_1/2 excited state of chlorine atom are reported. The present study believed to be the first theoretical investigation is compared with the recent experimental measurements (Yang et al., Astrophys. J. 810:132, 2015). Good agreements are obtained between theory and experiments. New SCUNC data are tabulated as useful references for interpreting astrophysical spectra from neutral atomic chlorine. [ABSTRACT FROM AUTHOR]