Knowledge Bank

The $B~2$A$\mathrm{<mrow\; data-mjx-texclass="ORD">1</mrow>}$ - $X~2$A$\mathrm{<mrow\; data-mjx-texclass="ORD">1</mrow>}$ $(000)$ bands of CaCH$\mathrm{<mrow\; data-mjx-texclass="ORD">3</mrow>}$ and SrCH$\mathrm{<mrow\; data-mjx-texclass="ORD">3</mrow>}$ have been observed at high resolution using laser excitation spectroscopy. The molecules were synthesized in a laser ablation/supersonic expansion spectrometer by the reaction of the ablated metal atoms with a 1$\%$ mixture of $(CH3)4Sn$ seeded in argon. The spectra for each molecule exhibit a symmetric top structure, with low J lines of multiple K components present. A rotational analysis is currently in progress, and a comparison of the spectroscopic and structural parameters for both molecules will be presented.