TY - JOUR AU - J. McGowan AU - E. Clarke BT - Physical Review DA - Jan-03-1968 DO - 10.1103/PhysRev.167.43 PY - 1968 SP - 43 EP - 51 T2 - Physical Review TI - Ionization of H(1s) near Threshold UR - http://link.aps.org/doi/10.1103/PhysRev.167.43 VL - 167 SN - 0031-899X ER -