Annealing effects in quench-condensed neon and argon films

Films of argon and neon were prepared on a cold substrate by quench-condens ation from the gas phase onto a surface acoustic wave device operated at 63 0 MHz. On annealing above the condensation temperature strong changes of th e sound velocity occur indicating structural rearrangement of the film. The annealing procedure has also significant influence on the temperature depe ndence of the sound velocity and attenuation which is governed by the prese nce of two-level tunneling states. (C) 1999 Elsevier Science B.V. All right s reserved.