Knowledge Bank

Jet cooled, high resolution ( MHz) spectra have been recorded for $A¯2E1/2\leftarrow X¯2A1$ transition of $CdCH3$ and for both spin-orbit components of the $A2\Pi \leftarrow X2\Sigma +$ transition of CdH. Hyperfine structure due to $\mathrm{<mrow\; data-mjx-texclass="ORD">111</mrow>}Cd$ and $\mathrm{<mrow\; data-mjx-texclass="ORD">113</mrow>}Cd$, both with $1=1/2$, is observed in both species. Additionally, CdH reveals hydrogen hyperfine splitting. The spectra from both species have been fit to a model that includes Fermi contact, electronic-nuclear dipolar and nuclear spinelectronic orbit interactions. The fitted parameters are compared to previous matrix ESR $studies1$ of X CdH and provide further support for the $A~\leftarrow X¯$ transition being principally metal centered $(Cd5px,y\leftarrow 5s)$ in both of these species.