Electron-rotation coupling in UV photodissociation of aligned diatomics

We investigate the effect of electron-rotation coupling ($\mathbf{R}\ensuremath{-}\mathrm{\ensuremath{\Omega}}$ coupling) on fs UV photodissociation dynamics aligned diatomic molecules. consider showcase ground-state $\mathrm{Mg}{\mathrm{H}}^{+}$ (${}^{1}{\mathrm{\ensuremath{\Sigma}}}^{+}$) pumped by an IR pulse, which initiates rotational leading to field-free molecular alignment. A time-delayed pulse probes degree alignment wave packet in framework spectroscopy. The correlates directly with angular distribution photofragments dissociative ${}^{1}\mathrm{\ensuremath{\Pi}}$ state, as it is shown our simulations comparing cases when $\mathbf{R}\ensuremath{-}\mathrm{\ensuremath{\Omega}}$ included and ignored. show how photofragment strongly affected at various delay times specific It was that increases intensity enhance photofragments. On contrary, increase initial temperature tends reduce coupling, explained fact such turns smaller increasing magnetic state $|{\mathrm{M}}_{0}|$ for each ${\mathrm{J}}_{0}$; furthermore, higher excited ${\mathrm{J}}_{0}$ contains more states ${\mathrm{M}}_{0}$, results have been averaged over all degenerated ${\mathrm{M}}_{0}$ states.