Flame spectroscopy of TiO: Chemiluminescence

A study has been made of emission spectra of TiO in chemiluminescent flames produced by reactions of titanium atoms with O₂, N₂O, NO₂, NO, and CO₂. Examination of the differences in intensity distributions of the Ti + N₂O and Ti + O₂ flames supports a recent experiment placing the a¹Δ state at about 3500 cm^?1 above the X³Δ ground state (1). An infrared system at 843.2 nm has been assigned as the ?(E³Π-X³Δ) system, which previously has been seen in an inert gas matrix (2). E³Π state constants (in cm^?1) obtained from measured gas-phase bandheads were found to be

$\text{T}{}_{00}\text{=}\text{11 899.3}\text{11 885.6}\text{11 870.6}\text{± 5.0, ω}{}_{\mathrm{e}}\text{= 924.2 ± 4.5, and ω}{}_{\mathrm{e}}\text{x}{}_{\mathrm{e}}\text{= 5.1 ± 1.0}$

Addition of active nitrogen to the flames was found to cause considerable enhancement of TiO emission.