Fluctuations in photoionization cross sections of singlet planar helium

Journal Article · Wed Sep 15 00:00:00 EDT 2010 · Physical Review. A

DOI:https://doi.org/10.1103/PHYSREVA.82.033422· OSTI ID:21450589

Eiglsperger, Johannes; Madronero, Javier ^[1]

---

1. Physik Department, Technische Universitaet Muenchen, DE-85747 Garching (Germany)

The fluctuating part of the total photoionization cross sections up to the 20th single ionization threshold from the ground state of helium are investigated within a planar model of the atom. The calculated fluctuations reproduce existing experimental observations rather well. The fluctuations are mainly due to a dominant series of resonances which can be associated with an approximate quantum number F=N-K. As the energy approaches the double ionization threshold, the dominant role of a single series as sole contributor is apparently lost as new series start to contribute significantly to the cross sections.

• OSTI ID: 21450589
• Journal Information: Physical Review. A, Vol. 82, Issue 3; Other Information: DOI: 10.1103/PhysRevA.82.033422; (c) 2010 The American Physical Society; ISSN 1050-2947
• Country of Publication: United States
• Language: English

Related Subjects

74 ATOMIC AND MOLECULAR PHYSICS
APPROXIMATIONS
ATOMS
CROSS SECTIONS
FLUCTUATIONS
GROUND STATES
HELIUM
PHOTOIONIZATION
PHOTON-ATOM COLLISIONS
QUANTUM NUMBERS
RESONANCE
ATOM COLLISIONS
CALCULATION METHODS
COLLISIONS
ELEMENTS
ENERGY LEVELS
FLUIDS
GASES
IONIZATION
NONMETALS
PHOTON COLLISIONS
RARE GASES
VARIATIONS