Nuclear magnetic relaxation ofKr83in krypton gas

Pulsed nuclear-magnetic-resonance measurements have been performed on ${}_{}{}^{83}{}_{}{}^{}\mathrm{Kr}$ in natural krypton gas at room temperature in a 2.114-T field. The spin-lattice relaxation time $T_1$ has been measured as a function of density $\rho$ (in amagat), with the result $\frac{1}{T_1}=\rho (2.13\mathrm{}\pm 0.05)\times {10}^{-3\mathrm{}}$ ${\mathrm{s}}^{-1\mathrm{}}$. $T_1$ has also been calculated by using the theories of Adrian and Staub. These results demonstrate that the nuclear quadrupole interaction is the relevant relaxation mechanism and that the inclusion of exchange interactions is necessary for an adequate description of collisions between rare-gas atoms. As a by-product, the chemical shift of the ${}_{}{}^{83}{}_{}{}^{}\mathrm{Kr}$ resonance frequency has been remeasured, confirming previous results.