Inner-Shell Photodetachment Thresholds: Unexpected Long-Range Validity of the Wigner Law

Journal Article · Fri Aug 19 00:00:00 EDT 2005 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.95.083001· OSTI ID:20699321

Bilodeau, R C ^[1]; Bozek, J D; Ackerman, G D ^[2]; Gibson, N D; Walter, C W ^[3]; Dumitriu, I; Berrah, N ^[1]

---

1. Western Michigan University, Physics Department, Kalamazoo, Michigan 49008-5151 (United States)
2. Lawrence Berkeley National Laboratory, Advanced Light Source, Berkeley, California 94720 (United States)
3. Department of Physics and Astronomy, Denison University, Granville, Ohio 43023 (United States)

Threshold behavior in inner-shell photodetachment is studied for the first time, specifically with 2-, 3-, or 4-electron emission from He{sup -} and S{sup -}. The threshold shapes are surprisingly consistent with the Wigner threshold law in all cases, despite large PCI effects observed in He{sup -}. In S{sup -}, the s-wave law is observed to agree with the data over an unprecedented range, more than an order of magnitude greater than predictions, and allows for the observation of the d-wave component. The measurements also demonstrate a means for obtaining precise core-excitation energies of free atoms.

• OSTI ID: 20699321
• Journal Information: Physical Review Letters, Vol. 95, Issue 8; Other Information: DOI: 10.1103/PhysRevLett.95.083001; (c) 2005 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0031-9007
• Country of Publication: United States
• Language: English

Related Subjects

74 ATOMIC AND MOLECULAR PHYSICS
ANIONS
D WAVES
ELECTRON DETACHMENT
ELECTRON EMISSION
EXCITATION
HELIUM IONS
PHOTON-ATOM COLLISIONS
S WAVES
SULFUR IONS