Relativistic Multichannel Theory: Scaling Behavior of Multichannel Quantum Defect Theory Parameters (μ_α, U_iα) Along the Ne-Like Iso-electronic Sequence

The compact physical parameters (μ_α, U_iα) in multichannel quantum defect theory (MQDT) can be directly calculated with relativistic multichannel theory (RMCT). Here we report a systematic study of the MQDT parameters (μ_α, U_iα) with RMCT along the Ne-like iso-electronic sequence (including Ca¹⁰⁺, Fe¹⁶⁺, Ge²²⁺, Ag³⁷⁺ ions). We find that the physical parameters (μ_α, U_iα) show a very interesting scaling behavior along the iso-electronic sequence.