Knowledge Bank

The $B\to X$ (3050 {\AA}) and $D \rightarrow $X(2350 {\AA}) band systems of XeCl are photographed using sources containing both natural $Cl2$ and isotopically pure $\mathrm{<mrow\; data-mjx-texclass="ORD">35</mrow>}C12$. The spectra permit us to refine the existing vibrational analysis of the $B\to X$ laser transition and obtain a complementary analysis of the $D\to X$ transition. The results show that the D state has smaller $Re$ larger $\omega e$, and larger $De$ than does the B state, as is found also in XeF. Higher $v\prime \prime$ levels are observed in the $D\to X$ spectrum, permitting us to obtain a more precise estimate of $De\prime \prime$ than was obtained previously from the $B\to X$ system alone.