Polarized Electron Physics        

Hexacontatetrapole




We are studying what atoms and ions look like after being excited by electron impact. The pictures shown here represent the individual multipole moments of the Ar+ (3p4 4p 2F) state resulting from the ionization of neutral ground-state argon by ~40 eV electrons. The atom actually looks like the "composite F state" picture. Until these experiments, no one had ever measured an atomic hexacontatetrapole (64-pole) moment. This work is discussed in a paper published in Physical Review Letters (H.M. Al-Khateeb, B.G. Birdsey, and T.J. Gay, 85, 4040 (2000)). (See it here). You can also find a discussion of multipoles here.
Check out these other moments: