Ion vortices in ion phase space in intense laser interaction with subcritical plasma Li, Baiwen ; Ishiguro, S. ; Skoric, M. M. ; Song, M. ; Sato, T. Abstract Publication: Journal of Plasma Physics Pub Date: December 2006 DOI: 10.1017/S0022377806005514 Bibcode: 2006JPlPh..72.1257L