PERMANENT ELECTRIC DIPOLE MOMENT OF CH

$^{1}$ D. H. Phelps and F. W. Dalby, Phys. Rev. Lett. 16, 3 (1966).Author Institution: Department of Chemistry, Arizona State University; Physical Chemistry Laboratory, South Parks Road Oxford UniversitySpectra in the $A^{2}\Delta -X^{2}\Pi (\lambda =431 nm)$ band system of the CH radical were recorded by the intermodulated fluorescence technique. The Stark effect on the $Q_{2e}(2)$ and $R_{1}(1)$ branch features was measured, and a determination of the value of the permanent electric dipole moment of the ground state was made. In this determination, a $(2F + 1)X(2F + 1), \Delta F= \pm 1$ Hamiltonian matrix, including Stark effect, was set up in a Hund's case ($a_{\beta}$) basis set and diagonalized to produce eigenvectors and eigenvalues. The calculated spectra were optimized to the experimental observations in a least-squares fashion to give the predicted value of $\mu(X^{2}\Pi)$. The determined value will be given, and compared with the previous $determination^{1}$