qspec.abc  (  i ,  j_l ,  f_l ,  j_u ,  f1_u ,  f2_u ,  as_sympy = False  )[source]

Parameters:

isympy_quant

The nuclear spin quantum number I.

j_lsympy_quant

The electronic total angular momentum quantum number J of the lower state.

f_lsympy_quant

The total angular momentum quantum number F of the lower state.

j_usympy_quant

The electronic total angular momentum quantum number J of the upper state.

f1_usympy_quant

The first total angular momentum quantum number F of the upper state. This is used for A and B.

f2_usympy_quant

The second total angular momentum quantum number F of the upper state.

as_sympybool

Whether to return the result as a sympy type.

Returns:

out(sympy_core | float, sympy_core | float, sympy_core | float)

The A, B and C coefficient as S-objects.