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The observation of “forbidden” transitions in He II photoelectron spectra

Excited State PropertyEngineeringPhysicsElectron SpectroscopyNatural SciencesSpectroscopyApplied PhysicsCondensed Matter PhysicsAtomic PhysicsPhotoelectric MeasurementQuantum ChemistryIi Photoelectron SpectraElectronic Excited StateSpectroscopic Property