TY - JOUR AU - A. Burgess AU - David Hummer AU - J. Tully BT - Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences DA - May-04-1972 DO - 10.1098/rsta.1970.0007 PY - 1970 SP - 225 EP - 279 T2 - Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences TI - Electron Impact Excitation of Positive Ions VL - 266 SN - 1364-503X ER -