Liquid excimers: lasing Xe(2) and Kr(2) in liquid argon

By pumping a small cryogenic cell with a 40-nsec, 1-MeV e-beam pulse, we have excited lasing in dilute mixtures of xenon or krypton in liquid argon. The lasing occurred at 175 nm for the excimer Xe(2) and at 147 nm for Kr(2).