Knowledge Bank

The hfs of some $Na2$ $23\Pi g$, $33\Pi g$, and $23\Pi g-21\Pi g$ mixed levels have been observed by CODR fluoresoence excitation spectroscopy. Both $23\Pi 1g$ and $33\Pi 1g$ levels have no resolved hfs within our OODR excitation resolution. $23\Pi Og$ and $33\Pi Og$ levels have hfs and their magnetic dipole hf constants are positive. The $23\Pi g$ V= $V\ast$-11, J=13, 14 levels are perturbed by the $21\Pi g$ V=27 levels of the same J. The OODR excitation lines to these perturbed levels from $A1\Sigma u(V\prime =22)-b3\Pi Ou(V\prime =25)J\prime =13,14$ levels have totally resolved hfs. From the intermediate level’s hfs, the magnetic dipole hf constants of these $23\Pi g-21\Pi g$ mixed levels have been determined and are negtive.