A nitrogen nucleus spin can adopt any of three orientations in a magnetic field, and its
Chapter 16, Problem 16.7(b)(choose chapter or problem)
A nitrogen nucleus spin can adopt any of three orientations in a magnetic field, and its energies are 0, } N$B, where N is the magnetogyric ratio of the nucleus. Deduce an expression for the partition function and mean energy of the nucleus and sketch the variation of the functions with B. Calculate the relative populations of the spin states at (a) 1.0 K, (b) 298 K when B = 20.0 T.
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