Nuclear Magnetic Resonance in the Cesium Halides

Abstract

The chemical shifts, the spin-lattice relaxation times, the isotropic exchange coupling $\tilde{A}$, and the pseudo-dipolar exchange coupling $\tilde{B}$ between cation and anion nuclear spins have been determined in a single crystal of CsBr. The results are: ${\sigma }_{\mathrm{Cs}}=(-1.9\mathrm{}\pm 0.4)\times {10}^{-4\mathrm{}}$, ${\sigma }_{\mathrm{Br}}=(-2.5\mathrm{}\pm 0.3)\times {10}^{-4\mathrm{}}$, ${\left(T_1\right)}_{\mathrm{Cs}}=1050\mathrm{}\pm 40$ sec, ${\left(T_1\right)}_{\mathrm{Br}}=0.105\mathrm{}\pm 0.020$ sec, $h^{-1\mathrm{}}\left|\tilde{A}\right|=55\mathrm{}$ ${\sec }^{-1\mathrm{}}$, $h^{-1\mathrm{}}\tilde{B}=15\mathrm{} or -89\mathrm{}$ ${\sec }^{-1\mathrm{}}$. Similar, but less complete, data have been obtained for a single crystal of CsI and a CsCl powder.