Knowledge Bank

Lambda-doubling transitions in gas phase $\mathrm{<mrow\; data-mjx-texclass="ORD">13</mrow>}CH$ in its $X2\Pi$ electronic state have been observed using the technique of Microwave Optical Double Resonance (MODR). As in previous $work1$, the CH radical was generated in situ in a discharge-flow system by the reaction between F atoms and methane. Laser induced fluorescence from the first members of the branches in the (0,0) band of the $A2\Delta -X2\Pi$ transitions of $\mathrm{<mrow\; data-mjx-texclass="ORD">13</mrow>}CH$ were used in the optical detection. The frequencies of the hyperfine components of five separate lambda-doubling transitions have been measured and used in to determine the lambda-doubling and hyperfine parameters in the molecular Hamilton. athe $\mathrm{<mrow\; data-mjx-texclass="ORD">13</mrow>}C$ hyperfine parameters will be discussed in terms of the electronic wave function for CH in the $X2\Pi$ state.