Theory of two-photon double ionization of helium at the sequential threshold

Journal Article · Tue Mar 15 04:00:00 EDT 2011 · Physical Review. A

DOI:https://doi.org/10.1103/PHYSREVA.83.033403· OSTI ID:21541309

Bachau, H ^[1]

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1. Centre des Lasers Intenses et Applications, Universite Bordeaux I-CNRS-CEA, 33405 Talence Cedex (France)

We analyze in this paper the process of double-electron ejection through two-photon absorption from the fundamental state of helium. We focus on the case of photon energies close to 2 a.u., which marks the threshold between direct and sequential double-ionization regimes. We demonstrate the crucial role of two-photon excitation-plus-ionization process of nlk{sup '}l{sup '} Rydberg series. We show that the latter channel must be taken into account in the theory in order to properly describe two-electron ejection. A simple expression is derived for the electron energy spectrum, leading to better insights into the physics underlying two-photon absorption close to the sequential threshold.

• OSTI ID: 21541309
• Journal Information: Physical Review. A, Journal Name: Physical Review. A Journal Issue: 3 Vol. 83; ISSN 1050-2947; ISSN PLRAAN
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
74 ATOMIC AND MOLECULAR PHYSICS
ABSORPTION
BOSONS
ELECTRONS
ELEMENTARY PARTICLES
ELEMENTS
ENERGY LEVELS
ENERGY SPECTRA
ENERGY-LEVEL TRANSITIONS
EXCITATION
EXCITED STATES
FERMIONS
FLUIDS
GASES
HELIUM
IONIZATION
LEPTONS
MASSLESS PARTICLES
NONMETALS
PHOTONS
RARE GASES
RYDBERG STATES
SORPTION
SPECTRA