Mirroring doubly excited resonances in argon.
New features are revealed in the low-energy photoionization spectrum of Ar by critically combining high photon resolution and differential photoelectron spectroscopic techniques. Two LS-forbidden doubly excited resonances are seen in the 3p(-1)(3/2, 1/2) partial cross sections which exhibit mirroring profiles, resulting in complete cancellation in the total photoionization cross section, as was predicted by Liu and Starace [Phys. Rev. A 59, R1731 (1999)]. These results demonstrate that a new class of weakly spin-orbit induced, mirroring resonances should be observable in partial, but not in total, collisional cross sections involving atoms, molecules, and solids in general.
Canton-Rogan
S E
SE
Department of Physics, Western Michigan University, Kalamazoo, Michigan 49008, USA.
Wills
A A
AA
Gorczyca
T W
TW
Wiedenhoeft
M
M
Nayandin
O
O
Liu
C N
CN
Berrah
N
N