Knowledge Bank

In a continuing study of first and second row transition metal monoxides, the molecular beam optical Stark spectrum of the $A2\Pi X2\Sigma +$ band system of scandium monooxide. ScO, has been recorded and analyzed. An electron bombardment effusive men was employed as the molecular beam source. Collimation was sufficient to produce laser induced fluorescence line widths of MHz (FWHM). The $A2\Pi 3/2A2\Pi 1/2$, and $X2\Sigma +$ states have first, pseudo-first, and second order Stark effects, the analysis of which produce permanent electric dipole moments of 4.06(3)D. 4.43(2)D, and 4.55(8)D, respectively. An analysis of the zero field hyperfine splitting of the optical spectrum was also performed. The $X2\Sigma +$ parameters were held fixed to the previously determined $values1$ and the $A2\Pi$ state hyperfine parameters were optimized in a least-squares fashion to produce the values: $a=135(1)MHz.d=177(2)MHz$ and $eOq0=84MHz$. The experimental values are compared with, theoretical predictions, simple one electron models and the previous results of Rice and $Field2$.