TY - JOUR AU - X. Guo AU - E. Bell AU - James Thompson AU - Gordon Dunn AU - M. Bannister AU - R. Phaneuf AU - A. Smith BT - Physical Review A DA - 1993-01 DO - 10.1103/PhysRevA.47.R9 PY - 1993 SP - R9 EP - R12 T2 - Physical Review A TI - Evidence for significant backscattering in near-threshold electron-impact excitation of Ar7+(3s -> 3p) VL - 47 SN - 1050-2947 ER -