Knowledge Bank

High resolution UV emission spectrum of the 410 nm band of the TiCl radical was measured by Fourier transform spectrometer (Bruker IFS120HR) with the resolution of $0.04cm-1$. This band was assigned as the electronic transition of $\mathrm{<mrow\; data-mjx-texclass="ORD">2</mrow>}\Phi -2\Delta$ band of the TiCl radical by Phillips and Davis [1], but recent study of ZrCl[2] suggested that this band might be $\mathrm{<mrow\; data-mjx-texclass="ORD">4</mrow>}\Gamma -X4\Phi$ or $\mathrm{<mrow\; data-mjx-texclass="ORD">4</mrow>}\Phi -X4\Phi$ band. In the present work a new electronic assignment of $\mathrm{<mrow\; data-mjx-texclass="ORD">4</mrow>}\Gamma -X4\Phi$ was proposed. The vibrational assignments were made for each subbands. The vibrational bands of (0-0), (1-1), (2-2), (3-3), and (4-4) were assigned for the subbands of $\mathrm{<mrow\; data-mjx-texclass="ORD">4</mrow>}\Gamma 5/2-4\Phi 3/2$ and $\mathrm{<mrow\; data-mjx-texclass="ORD">4</mrow>}\Gamma 7/2-4\Phi 5/2$. For the subband of $\mathrm{<mrow\; data-mjx-texclass="ORD">4</mrow>}\Gamma 9/2-4\Phi 7/2$, the (0-0), (1-1) and (2-2) bands were assigned, but for the $\mathrm{<mrow\; data-mjx-texclass="ORD">4</mrow>}\Gamma 11/2-4\Phi 9/2$ subband, only (0-0) band was assigned. Rotational analysis were done for $\mathrm{<mrow\; data-mjx-texclass="ORD">4</mrow>}\Gamma 5/2-4\Phi 3/2$ and $\mathrm{<mrow\; data-mjx-texclass="ORD">4</mrow>}\Gamma 7/2-4\Phi 5/2$ subbands. The band origins, rotational constants, and centrifugal distortion constants were determined by the least square method. The rotational constants were consistent with those reported by Ram and Bernath [3] within the experimental error. ***From the line intensities of P- and R- branches, $\Delta \Lambda$ was derived to be +1, and therefore upper state was determined to be $\mathrm{<mrow\; data-mjx-texclass="ORD">4</mrow>}\Gamma$. Further measurements and analysis for the subbands of $\mathrm{<mrow\; data-mjx-texclass="ORD">4</mrow>}\Gamma 9/2-4\Phi 7/2$ and $\mathrm{<mrow\; data-mjx-texclass="ORD">4</mrow>}\Gamma 11/2-4\Phi 9/2$ should be needed to confirm the present electronic assignment definitely.