Sinds we already know the values of μ1 and I1, and we can determine the value of the hyperfine constant ‘a’ from. We should be able to easily determine the value of μ2, given the value of I2. This because we assume that the hyperfine constant for both isotopes is the same (constant), and can be determined experimental. If we know this value, it will be easy to determine the ratio of Bj to hbar2 J. This ratio will be the same for both isotopes, sinds they are determined by the electron cloud (which is the same in both isotopes). Sinds I2 is known, μ2 can easily be calculated from the ratio of (hbar2 a J I2)/(Bj).