Theoretical photoabsorption spectrum of Ar3+

We have calculated the photoabsorption spectrum at 0 K of Ar3+ within the framework of the diatomics-in-molecules (DIM) method using highly accurate diatomic potential energy curves. Both the wavelength of the visible absorption maximum and its corresponding absolute cross-section are predicted in agreement with the experimental data. Finite temperature Monte Carlo simulations have been carried out in order to reproduce the experimental UV absorption band.