Phys. Rev. Lett. 84, 2598–2601 (2000)Radiative Decay of Doubly Excited States in Helium below the He+ (N = 2) Ionization ThresholdReceived 5 January 1999; published in the issue dated 20 March 2000 The radiative decay of 1Po doubly excited states in helium has been investigated using a novel apparatus in which metastable atoms and vacuum ultraviolet photons are detected. The intensity ratio of the energetically narrow (sp,2n-)1Po and (2p,nd)1Po series to the broader (sp,2n+)1Po series is strikingly enhanced in comparison with conventional photoabsorption, photoion, or photoelectron measurements using synchrotron radiation. The experimental approach is a new way forward for the study of energetically narrow doubly excited states. © 2000 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.84.2598
DOI:
10.1103/PhysRevLett.84.2598
PACS:
32.80.Dz, 32.50.+d, 32.80.Fb
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