Collectively enhanced resonant photoionization in a multi-atom ensemble
  Photoionization of an atom via interatomic correlations to N neighboring atoms may be strongly enhanced due to constructive interference of quantum pathways. The ionization proceeds via resonant photoexcitation of a neighbor atom and subsequent interatomic Coulombic decay. The enhancement can scale with N^2, leading to "super-enhanced photoionization". 
Carsten M\"uller, Mihai A. Macovei and Alexander B. Voitkiv
physics.atom-ph quant-ph