TY - JOUR AU - Sydney Geltman BT - Physics Letters DA - Jan-04-1963 DO - 10.1016/0031-9163(63)90348-2 PY - 1963 SP - 168 EP - 169 T2 - Physics Letters TI - Double-photon photo-detachment of negative ions VL - 4 SN - 00319163 ER -