Abstract
We discuss both relative spatial diffusion coefficient and relative velocity diffusion coefficient for electrons interacting with coherent, localized Langmuir wave packets. We find that and have nearly the same positions in which they get a nonzero minimum for small relative position and relative velocity and the diffusion coefficients are greatly reduced dose to minima. We also find that the position in which has a minimum shifts when and vary, while the position for does not move. So we show that the coherent, localized wave packets can drive the formation of strong two-point microscale correlation in phase space only when r and u are small. We also discuss the lifetime of clump.
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