Equation is simple
(1) Te=T0+ASL
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-Te : Energy (w/ splitting)
-T0 : Energy (w/o splitting)
-A : spin-orbit coupling constant
-S : projection of total electronic spin angular momentum
-L : projection of orbital angular momentum
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Te can get in a textbook written by G. Herzberg.
But i couldn't get T0 or A and any associated factors.
I need the A value of every J term to distinguishing Hund's case.
(Typically, A of the OH is known as -142 cm-1.)
If you know about this, please explain how to get it.
Thank you.