the field between 0.43 and 2.9 T as we expect for the naf phase. The maximum shift, 1.6 G, in the shoulder of the observed line must equal the maximum possible demagnetizing field M/M 0 x (3.3 G). This gives M/M 0^ 0.5 and is in relatively good agreement with the results of Ref. 2 and our model.We wish to thank D. D. Osheroff, T. C. Prewitt, T. M. Goodkind, and E. D. Adams for communicating their preliminary results, and J. A. Cowen and A. Landesman for many discussions.The alkali hyper oxides A + 0 2 " (A =Na,K,Rb,Cs) are model substances to investigate TT-electron magnetism. 1 * 2 The small symmetric and inorganic molecule anion, effectively a "pseudohalide," gives rise to interesting magnetic order. The peculiarities of the hyperoxide ion 0 2 " are important for the understanding of the many fascinating properties of the A0 2 : (i) The magnetic moment is localized on a (2p)ir g orbital, (ii) The ground state X 2 U g of the free molecule ion is or-
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