Argon L-shell fluorescence yields in Ar+-Ar collisions

X-ray spectra from Ar-Ar collisions at various energies are used in conjunction with theoretical (Hartree-Fock) calculations to obtain relative probabilities of states of excitation of the Ar atoms. These in turn are used to obtain semi-empirical mean fluorescence yield values. The fluorescence yields thus obtained are compared with those obtained from total auger and X-ray measurements. Large discrepancies are found and reasons for them are discussed.