Knowledge Bank

Spectra of GeCl and SnCl were excited in a radio frequency discharge at a low pressure. Bands of the GeCl molecule in the region 335-370 nm have been attributed to the $\mathrm{<mrow\; data-mjx-texclass="ORD">4</mrow>}\Sigma --X2\Pi$ transition on the basis of high resolution studies of the bands at 339.2 and 350.1 nm. The rotational analysis of the (0,0) band of the $\mathrm{<mrow\; data-mjx-texclass="ORD">4</mrow>}\Sigma 3/2--X2\Pi 3/2$ subsystem has been carried out. The $BO\prime \prime$ value obtained by the author disagrees with that derived from a rotational analysis of the $B2\Sigma +-X2\Pi 3/2$ $subsystem1$ The (0,0) subbands at 348.6 and 375.8 nm of the $\mathrm{<mrow\; data-mjx-texclass="ORD">4</mrow>}\Sigma -X2\Pi$ system of the SnCl molecule have been recorded at high resolution and analyzed. The rotational constants for the $\mathrm{<mrow\; data-mjx-texclass="ORD">4</mrow>}\Sigma 1/2-,4\Sigma 3/2-,X2\Pi 1/2$ and $X2\Pi 3/2$ states have been calculated. The constants calculated by the author agree well with the previous results for the $\mathrm{<mrow\; data-mjx-texclass="ORD">4</mrow>}\Sigma 3/2-,X2\Pi 1/2$ and $X2\Pi 3/2$ $substates2$