We report on magneto-optical trapping of the two fermionic isotopes of atomic titanium, ${}^{47}\mathrm{Ti}$ and ${}^{49}\mathrm{Ti}$. Unlike the even mass-number isotopes, which were recently laser cooled, ${}^{47}\mathrm{Ti}$ and ${}^{49}\mathrm{Ti}$ have nonzero nuclear spins and, consequently, their atomic levels are split by hyperfine structure. Combining and comparing theoretical calculations and atomic beam-spectroscopy measurements, we determine the hyperfine structures and isotope shifts of the $3d^{2}4s^2$ $a^3{F}_4\to 3d^2{(}^{3}P)4s4p{(}^3{P}^o)$ $y^5{D}_4^o$ optical-pumping transition at optical wavelength $391\mathrm{nm}$ and the $3d^3{(}^{4}F)4s$ $a^5{F}_5\to 3d^3{(}^{4}F)4p$ $y^5{G}_6^o$ laser-cooling transition at wavelength $498\mathrm{nm}$. With this information, we produce magneto-optical traps of both ${}^{47}\mathrm{Ti}$ and ${}^{49}\mathrm{Ti}$ by applying two additional tones of light to repump atoms to the maximum-spin states on the laser-cooling transition. Directly loading from the atomic flux of a titanium sublimation pump, we produce ${}^{47}\mathrm{Ti}$ and ${}^{49}\mathrm{Ti}$ traps with 731(190) and 1142(240) atoms, and with lifetimes of $330\left(15\right)$ and $310\left(8\right)\mathrm{ms}$, respectively.

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• Atom & ion cooling
• Atom & ion trapping & guiding
• Atomic & molecular structure
• Atomic spectra
• Electronic transitions
• Fine & hyperfine structure
• Lineshapes & shifts
• Magneto-optical spectra
• Optical pumping