6. Some organic molecules have a triplet (S =1) excited state at an energy kBA above the (singlet) ground state (S = 0). (a) Find the expression for the average magnetic moment in the field B. (b) Show the susceptibility for T >> A is approximately independent of A. (c) With the help of a diagram of energy levels versus field and a rough sketch of entropy versus field , explain how this system might be cooled by adiabatic magnetization (not by demagnetization) Triplet (1, = +1) Singlet ITTY 1/V2( ITL ) - IT) ) (1, = 0) 1/ V2 (IT+ ) + 14 1) ) (1, = -1)