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 mirrorin...

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Bibliographic Details
Published in:Physical review letters 2000-10, Vol.85 (15), p.3113-3116
Main Authors: Canton-Rogan, S E, Wills, A A, Gorczyca, T W, Wiedenhoeft, M, Nayandin, O, Liu, C N, Berrah, N
Format: Article
Language:English
Subjects:
ARGON
ATOMS
CANCELLATION
CROSS SECTIONS
PHOTOIONIZATION
PHOTONS
PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
RESOLUTION
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Summary: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.
ISSN:0031-9007
1079-7114
DOI:10.1103/PhysRevLett.85.3113