qspec.models.hf_trans  (  i ,  j_l ,  j_u  )[source]

Calculate all allowed hyperfine transitions and their hyperfine coefficients.

Parameters:

iscalar

The nuclear spin $I$.

j_lscalar

The total lower state electron angular momentum $J$.

j_uscalar

The total upper state electron angular momentum $J^\prime$.

Returns:

transitionslist[list[tuple]]