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Photoionisation of atomic phosphorus

The photoionisation spectrum of atomic phosphorus prepared by successive abstraction reactions involving H atoms and PH3, is presented from its ionisation threshold to 765 A. Prominent autoionisation structure is observed between the fine-structure limits3P2-3P0 near the ionisation threshold. In addition, a window resonance series is seen, involving inner s-shell excitation to . . .(5S)np 4P states. Some systematic behaviour of resonance profiles and quantum defects in a series of atoms is discussed.