Knowledge Bank

Three near infrared electronic transitions of NiCl have been reanalyzed. Hougen's recent (2011) theoretical investigation of low-lying states of metal halides with a $d9$ electronic configuration indicated that the signs of the experimental spin-rotation and lambda-doubling signs for the low-lying $\Omega$=1/2 states of NiCl were not correct. This problem is corrected by assuming an excited state with $\mathrm{<mrow\; data-mjx-texclass="ORD">2</mrow>}\Sigma -$ symmetry instead of $\mathrm{<mrow\; data-mjx-texclass="ORD">2</mrow>}\Sigma +$ symmetry. Line positions for the $[12.3]2\Sigma -$ - $X2\Pi 3/2$, $[12.3]2\Sigma -$ - $X2\Pi 1/2$, and $[12.3]2\Sigma -$ - $B2\Sigma +$ electronic transitions have been refitted, and the new spin-rotation and lambda-doubling signs agree with the Hougen theory. The results of the analysis will be presented.