Measurements of spontaneous-emission rates in atomic thallium

We report measurements of the following spontaneous-emission rates in atomic thallium: $A(6\mathrm{}{D}_{\frac{3}{2}}-7P_{\frac{1}{2}})=(5.97\mathrm{}\pm 0.78)\times {10}^5{\mathrm{s}}^{-1\mathrm{}}$, $A(7\mathrm{}{P}_{\frac{1}{2}}-7S_{\frac{1}{2}})=(1.71\mathrm{}\pm 0.07)\times {10}^7{\mathrm{s}}^{-1\mathrm{}}$, $A(7\mathrm{}{P}_{\frac{3}{2}}-7S_{\frac{1}{2}})=(2.37\mathrm{}\pm 0.09)\times {10}^7{\mathrm{s}}^{-1\mathrm{}}$, and $A(8\mathrm{}{P}_{\frac{3}{2}}\to \mathrm{all})=(9.2\mathrm{}\pm 1.0)\times {10}^6{\mathrm{s}}^{-1\mathrm{}}$. These results are compared to predictions of theoretical models and lend support to calculations of the recently measured parity-nonconserving circular dichroism of the $6P_{\frac{1}{2}}-7P_{\frac{1}{2}}$ forbidden $M1\mathrm{}$ transition in thallium.