Single-photon double ionization of H2 molecule away from equilibrium: A showcase of two-centre electron interference
Date
2012
Authors
Serov, V V
Ivanov, Igor
Kheifets, Anatoli
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American Physical Society
Abstract
We demonstrate the effect of two-center interference on single-photon double ionization [double photoionization (DPI)] of the aligned H2 molecule when it shrinks or expands from the equilibrium internuclear distance. This interference affects the first stage of the DPI process in which the primary photoelectron is ejected predominantly along the polarization axis of light and its geometrical interference factor is most sensitive to the internuclear distance in the parallel (Σ) orientation of the internuclear and polarization axes. This effect is responsible for strong modification of the DPI amplitude in the parallel orientation while the corresponding amplitude for the perpendicular (Π) orientation is rather insensitive to the internuclear distance. The combination of these two factors explains the profound kinetic energy release effect on the fully differential cross sections of DPI of H2.
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Keywords: Double photoionization; Electron interference; Fully differential cross sections; Interference factor; Internuclear distances; Kinetic energy release; Parallel orientation; Polarization axes; Polarization axis; Single-photon double ionization; Two-center
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Physical Review A: Atomic, Molecular and Optical Physics
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Journal article
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Open Access
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