Hyperfine Structure of1snpP3Terms ofLi6,7ii

Using the beam-foil technique, we have observed zero-field quantum beats in the intensity decays of transitions from the $1snp{}_{}{}^3{}_{}{}^{}P$ terms ($n=2, 3, 4, 5$) in ${}_{}{}^{6,7}{}_{}{}^{}\mathrm{Li}$ ii, and deduced the magnetic hyperfine coupling constant for each isotope for the $2p {}_{}{}^3{}_{}{}^{}P$ terms. Preliminary values for these coupling constants are $A(1s2p{}_{}{}^3{}_{}{}^{}P, {}_{}{}^6{}_{}{}^{}\mathrm{Li}ii)=0.091\mathrm{}\pm 0.001$ ${\mathrm{cm}}^{-1\mathrm{}}$ (2.73 GHz), $A(1s2p{}_{}{}^3{}_{}{}^{}P, {}_{}{}^7{}_{}{}^{}\mathrm{Li}ii)=0.239\mathrm{}\pm 0.002$ ${\mathrm{cm}}^{-1\mathrm{}}$ (7.17 GHz). The measured fine structures agree with recent calculations within a few percent.