A photoluminescence spectrometry of sufficient precision performed on the new isotope will reveal its hyperfine zero-field splitting energies which can be noted as corrections to the corresponding Zeeman lines. From these corrections must be ordered according to their J, F and I configurations, then factored accordingly to produce the common term containing mu_2*B_j/I_2J. Comparing to the previous isotope can eliminate B_j and J, and multiplying by I_2/I_1mu_1 will produce mu_2.