Title: Effect of Autoionizaion on (1+2)-photon Above-Threshold Ionization of H2 Molecules Authors: Krishna Rai Dastidar and Ratan Kumar Das Affiliations: Department of Spectroscopy, Indian Association for the Cultivation of Science, Calcutta - 700032, India Summary: We have theoretically studied the effect of autoionization through the doubly excited autoionizing states of u-symmetry, on the photoelctron energy spectrum (PES) in (1+2)-photon above threshold ionization of H2 molecules. Both dissociative autoionization and autoionization to the bound vibrational levels of H2+ ion have been considered. We have shown that the PES is oscillatory in nature and shows structure similar to that observed in a recent experiment by Rottke et. al., J. Phys. B, Vol. 30, 4049 (1997).