Hyperfine-structure constants fori473d24s23P

We report magnetic dipole hyperfine-structure constants, obtained by doing nonrelativistic configuration-interaction calculations, for ${}_{}{}^{47}{}_{}{}^{}\mathrm{Ti}$ i 3${\mathit{d}}^2$4${\mathit{s}}^2$ ${}_{}{}^3{}_{}{}^{}$P, which are in excellent agreement with experiment [theory (experiment) ${\mathit{A}}_2$=-23.150 (-25.215) MHz, ${\mathit{A}}_1$=2.202 (2.665) MHz] in contrast with Hartree-Fock and some semiempirical values. Second-order electrostatic effects, arising mainly from the 3${\mathit{d}}^3$4s configuration, are crucial to understanding this system. The nuclear quadrupole coupling constant is -138.4 MHz and 69.2 MHz×Q (in b) (J=1,2). By combining with measurement, we predict Q=0.346 b. Hyperfine-structure constants are also given for the 3${\mathit{d}}^3$4s and 3${\mathit{d}}^4$ ${}_{}{}^3{}_{}{}^{}$P terms.