Abstract
We investigate single photon double ionization (spDI) of substituted benzenes (toluene, chlorobenzene and fluorobenzene) in photon energy of 20–40 eV. We observe that a resonance-like enhancement of spDI, which deviates from the prediction of the “knock-out” mechanism, appears at a specific photon energy near the threshold for halogenated benzenes, but not for toluene. The enhanced spDI occurs if the de Broglie wavelength of the two-electron pseudoparticle matches the size of the conjugated p-π orbital of halogenated benzene. Our study shows that the molecular spDI is not a local event and the molecular orbital plays a pivotal role in double ionization.
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