TY - JOUR AU - M. Lambropoulos AU - S. Moody AU - S. Smith AU - Carl Lineberger BT - Physical Review Letters DA - Jan-07-1975 DO - 10.1103/PhysRevLett.35.159 PY - 1975 SP - 159 EP - 162 T2 - Physical Review Letters TI - Observation of Electric Quadrupole Transitions in Multiphoton Ionization VL - 35 SN - 0031-9007 ER -