Knowledge Bank

An explanation of the photodetachment spectra of $OH-$, $SH-$ and $SeH-$ is given in terms of the rotational line strengths of a $\mathrm{<mrow\; data-mjx-texclass="ORD">3</mrow>}\Pi ,1\Pi \leftarrow 1\Sigma +$ system. Rotational coupling in the complex AH + $e-$ is found to be important. These techniques can also be used for interpreting the band contours in photoelectron spectroscopy.