Charge of dust particles in a particle chain
  Charged dust particles form structures which are extended in the vertical direction in the electrode sheath of a rf discharge when confined within a glass box. The charge on each particle as a function of height varies due to the changing plasma conditions and the wakefield of upstream particles. Here an analysis of the equilibrium state of chains of varying number of particles is analyzed to determine the charge on each particle within a vertically extended chain as well as the magnitude of the positive wakefield charge. 
Razieh Yousefi, Mudi Chen, Lorin Swint Matthews, Truell W. Hyde
physics.plasm-ph