Relativistic electromagnetic solitons in the electron-ion plasma

We present the results of the investigation about the ion motion influence on relativistic soliton structure, and show that in the case of moving mult inode solitons the effect of the ion dynamics results in the limiting of it s amplitude. The constraint on the maximum amplitude corresponds to either the ion motion breaking in the low-node-number case, or to the electron tra jectory self-intersection in the case of high-node-number solitons. The sol iton breaking leads to the generation of fast ions, and provides a novel me chanism for the ion acceleration in the plasma irradiated by the high-inten sity laser pulses.