TY - JOUR AU - V. Čermák BT - The Journal of Chemical Physics DA - Jan-01-1966 DO - 10.1063/1.1726533 PY - 1966 EP - 3774 T2 - The Journal of Chemical Physics TI - Individual Efficiency Curves for the Excitation of 23S and 21S States of Helium by Electron Impact UR - http://link.aip.org/link/?JCP/44/3774/1\&Agg=doi VL - 44 SN - 00219606 ER -