Theoretical photoabsorption spectrum of Ar-3(+)

We have calculated the photoabsorption spectrum at 0 K of Ar-3(+) within th e framework of the diatomics-in-molecules (DIM) method using highly accurat e diatomic potential energy curves. Both the wavelength of the visible abso rption maximum and its corresponding absolute cross-section are predicted i n agreement with the experimental data. Finite temperature Monte Carlo simu lations have been carried out in order to reproduce the experimental UV abs orption band. (C) 1999 Elsevier Science B.V. All rights reserved.