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We have studied the high harmonic generation and attosecond pulse production in a plasma or gas under conditions when the single-atom response is affected by neighboring ions of the medium. We solve numerically the threedimensional Schrodinger equation for a single-electron atom in the combined fields of the parent ion, the neighboring particles and the laser, and average the results over different random positions of the particles using the Monte-Carlo method. We observe a change of thedoi:10.1117/12.675492 fatcat:ic6jpt34z5fr5hxwjx2wbdixke