Knowledge Bank

Dispersed phosphorescence spectra of the transition a $\mathrm{<mrow\; data-mjx-texclass="ORD">3</mrow>}B1-X1A1$ of $\mathrm{<mrow\; data-mjx-texclass="ORD">18</mrow>}O$-labled $SO2$ in solid Ne were recorded in the spectral region 388-478 nm during laser excitation. As zero-phonon lines are well resolved, we were able to identify all three vibrational modes of the $X1A1$ state, and to monitor emission from a specific isotopomer (in particular $\mathrm{<mrow\; data-mjx-texclass="ORD">16</mrow>}OS18O)$ to obtain its corresponding excitation spectra. The vibronic patterns of excitation spectra of $S16O2$ and $S18O2$ in the spectral range 351-388 nm are similar to those observed in the gaseous phase, with severely perturbed lines above $a3B1$ (110) at $27005cm-1$. New lines in two groups were observed for $\mathrm{<mrow\; data-mjx-texclass="ORD">16</mrow>}OS18O$; they are identified as lines associated with the $\nu 3$ of $a3B1$ and of $b3A2$. These observations enable us to report $\nu 3=922cm-1$ for $a3B1,\nu 2=315$ and $\nu 1=771cm-1$ for $b3A2$, and a false origin at $26653cm-1$ for the $b3A2(001)-X1A1(000)$ transition of $\mathrm{<mrow\; data-mjx-texclass="ORD">16</mrow>}OS18O$.