Knowledge Bank

The ArO green excimer transition is investigated theoretically. Approximate ArO model potential are constructed for the upper and lower states by adding the attractive long-range dispersion energy to the short-range repulsion calculated ab initio. The bound-bound and thermally averaged free-free and free-bound contributions to the $\mathrm{<mrow\; data-mjx-texclass="ORD">1</mrow>}\Sigma -1\Sigma$ and $\mathrm{<mrow\; data-mjx-texclass="ORD">1</mrow>}\Sigma -1\Pi$ emission spectra are calculated quantum mechanically using the long-range quadrupole-induced dipole transition moment. The continuum spectrum is also calculated classically and compared to the quantum calculation. The calculated bound-bound spectrum and total two-body emission coefficient are in reasonable agreement with experiment. The blue tail of the continuum emission is calculated to be much weaker than measured, implying a significant departure of the transition moment from its long-range form at distances near the minimum of the upper state potential.