Acoustic surface plasmon on Cu(111) K. Pohl, B. Diaconescu, G. Vercelli, L. Vattuone, V. M. Silkin, E. V. Chulkov, P. M. Echenique and M. Rocca EPL, 90 5 (2010) 57006 Published online: 05 July 2010 DOI: 10.1209/0295-5075/90/57006