The Magnetic Susceptibility of Nitrogen Dioxide

A method has been developed whereby sensitivities for volume susceptibilities as high as 3×${10}^{-15\mathrm{}}$ can be obtained. The main improvement in the method over that of other observers is in the construction of lighter test bodies and the use of smaller fibers. The method is applied to the measurement of the susceptibility of N${\mathrm{O}}_2$. The results agree within the limit of experimental uncertainties with Van Vleck's theoretical value for the molecular susceptibility of N${\mathrm{O}}_2$ namely, $\chi \left(\mathrm{N}{\mathrm{O}}_2\right)=0.375\mathrm{}\chi \left({\mathrm{O}}_2\right)$. The susceptibility of ${\mathrm{N}}_2$ ${\mathrm{O}}_4$ comes in as a second order effect and the value $\chi \left({\mathrm{N}}_2{\mathrm{O}}_4\right)=-30\mathrm{}\times {10}^{-6\mathrm{}}$ ±20 percent is in fair agreement with the value $\chi \left({\mathrm{N}}_2{\mathrm{O}}_4\right)=-25.8\mathrm{}\times {10}^{-6\mathrm{}}$ obtained by T. Soné.