PHOTOIONIZATION STUDY OF THE SINGLETS [1S22P(2P3/2)NS 1P, 1S22P (2P)ND 1P, 1S22P (2P1/2)NP 1P, 1S22P (2P3/2)NP 1D] AND TRIPLETS [1S22P (2PO)NS 3P0,1,2 ] RYDBERG SERIES FOR THE NIV IONS VIA THE MODIFIED ATOMIC ORBITAL THEORY

In this paper, we report resonance energies and quantum defect of the singlets 1s²2p (²P_3/2)ns ¹P, 1s²2p (²P)nd ¹P , 1s²2p (²P_1/2)np ¹P, 1s²2p (²P_3/2)np ¹D and triplets 1s²2p (²P^o)ns ³P_0,1,2 , Rydberg series from the ground state of N³⁺ (NIV) ions. Calculations are performed from n =3 to n =20 using the Modified Atomic Orbital Theory (MOAT) formalism. Very good agreements are seen between the present calculations and the available theoretical and experimental data. The present predicted data up to n = 20 may be a great importance for the atomic physics communityin connection with the understanding of the chemical evolution of the N element in the Universe.