In hydrogen, an external magnetic field, which we calculate to be approximate to 16.65 T, cancels the internal field caused by the electron motion in the magnetic sublevels with m(J) = +1/2. This results in an energy-level degeneracy between states with nuclear magnetic sublevels m(I) of opposite signs. The evaluation of this field has been calculated previously with the use of the low-field quantum numbers F; m(rho). We show that this calculation is considerably simpler in the high-field m(J); m(I) representation. A comparison is given with the earlier work. (C) 2015 American Association of Physics Teachers.
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