Grain charging in an intermediately collisional plasma S. A. Khrapak, P. Tolias, S. Ratynskaia, M. Chaudhuri, A. Zobnin, A. Usachev, C. Rau, M. H. Thoma, O. F. Petrov, V. E. Fortov and G. E. Morfill EPL, 97 3 (2012) 35001 Published online: 20 January 2012 DOI: 10.1209/0295-5075/97/35001