For spin-orbit interaction tex2html_wrap119 where tex2html_wrap120 = internal field generated by nucleus. tex2html_wrap121 where tex2html_wrap122 is the bohr magneton. From electron's perspective tex2html_wrap123 with tex2html_wrap124 . Then tex2html_wrap125 tex2html_wrap126

tex2html_wrap127 . tex2html_wrap128

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