Significantly improved XeF(C→A) laser performance has been achieved using electron beam excitation of complex, multicomponent gas mixtures specifically tailored so as to reduce medium transient absorption in the blue‐green region. Use of Ar and Kr together as the effective rare gas buffer‐energy transfer species, along with a combination of NF3and F2to produce the desired F‐donor molecule characteristics, has permitted synthesis of near optimum medium properties for which XeF(C) is produced efficiently while transient absorption is minimized. With this technique we have achieved laser pulse energy density and intrinsic efficiency of 2.2±0.3 J/l and ∼1.5%, respectively, values that are comparable to those of theB→Xrare gas‐halide lasers.