TY - JOUR AU - B. Van Zyl AU - Gordon Dunn AU - G. Chamberlain AU - D. Heddle BT - Physical Review A DA - Jan-11-1980 DO - 10.1103/PhysRevA.22.1916 PY - 1980 SP - 1916 EP - 1929 T2 - Physical Review A TI - Benchmark cross sections for electron-impact excitation of n 1S levels of He VL - 22 SN - 0556-2791 ER -