Knowledge Bank

Bulk TiO$\mathrm{<mrow\; data-mjx-texclass="ORD">2</mrow>}$ is a widely used photo-activated catalytic material, yet poorly understood. Much of the motivation for studies of molecular TiO$\mathrm{<mrow\; data-mjx-texclass="ORD">2</mrow>}$ is the observation {\textbf{129}} 3022, 2007.} that there is a smooth correlation of the molecular electronic states to the band gap of the bulk. The field-free energy levels of the ground state of the monomer have been fully characterized by microwave spectroscopy. {\textbf{676}} 1367, 2008.} Here we report on the visible spectrum in the region between 18200 cm$\mathrm{<mrow\; data-mjx-texclass="ORD">-1</mrow>}$ to 18750 cm$\mathrm{<mrow\; data-mjx-texclass="ORD">-1</mrow>}$ of a cold molecular beam sample of TiO$\mathrm{<mrow\; data-mjx-texclass="ORD">2</mrow>}$ using laser induced fluorescence detection and mass-selected REMPI. Bands at 18240 cm$\mathrm{<mrow\; data-mjx-texclass="ORD">-1</mrow>}$, 18411 cm$\mathrm{<mrow\; data-mjx-texclass="ORD">-1</mrow>}$ and 18470 cm$\mathrm{<mrow\; data-mjx-texclass="ORD">-1</mrow>}$ were recorded at a resolution of 40 MHz and rotationally analyzed. The dispersed fluorescence of 18411 cm$\mathrm{<mrow\; data-mjx-texclass="ORD">-1</mrow>}$ and 18470 cm$\mathrm{<mrow\; data-mjx-texclass="ORD">-1</mrow>}$ bands were analyzed to produce a set of vibrational parameters for the ground state. The optical Stark spectra of the 18411 cm$\mathrm{<mrow\; data-mjx-texclass="ORD">-1</mrow>}$ and 18470 cm$\mathrm{<mrow\; data-mjx-texclass="ORD">-1</mrow>}$ bands were recorded and analyzed to determine permanent electric dipole moments and compared with the results for the band at 18655 cm$\mathrm{<mrow\; data-mjx-texclass="ORD">-1</mrow>}$ {\textbf{11}} 2649, 2008.}