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Absolute direct excitation cross sections from the neutral ground state have been measured for upper levels of the strongest laser transitions in Ar II to within errors of ^20 %. Reasonable agreement is obtained with calculated values of these cross sections based on the sudden' approximation made by Koozekanani with Hartree-Fock wave functions and intermediate coupling.

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Calculations have been carried out for the photoionization cross sections of excited states of atomic argon and krypton, relevant to the KrF laser. At λ=2486 Å, it is found that photoabsorption due to the 3P0,2 metastable states is relatively unimportant, while the cross sections for the first excited p states are large (∼4.5 ×10−18 cm2).