The K³⁹ nuclear magnetic resonance has been observed in metallic potassium and in aqueous solutions of KNO₃ and K₃Co(CN)₆. From these observations a Knight shift of (0.248±{}0.005)% has been obtained. Using Pines' value 0.60×{}10^-6 for the spin susceptibility gives Pf=0.95 a₀^-3. This is compared with the theoretical values 0.786 a₀^-3 obtained by Callaway and 0.909 a₀^-3 obtained by a quantum defect calculation in this paper.
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Milford et al. (1961) studied this question.
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