A new system for photon induced fluorescence spectroscopy applied to the study of doubly excited states of helium

Research output: Contribution to journalArticle


A new system for photon induced fluorescence spectroscopy (PIFS) at the gas phase photoemission beamline (Elettra, Trieste) is described. It consists of a novel non-dispersive detector for VUV photons and a spectrometer for UV/visible light with cooled CCD detector. To illustrate the performance of the apparatus, the fluorescence decay of the doubly excited states of helium below the N = 2 ionization threshold has been studied. Fluorescence emission from both singlet and triplet states has been observed, and in particular weak visible emission resulting from decay of 7(3D) and 8(3D) triplet states confirmed the recently published assignment of these states. This illustrates how PIFS can be used to provide a direct and unambiguous verification of the assignments of states observed in photoabsorption.


  • M Coreno
  • M de Simone
  • M Danailov
  • R Richter
  • Antti Kivimäki
  • M Zitnik
  • K C Prince
Research areas and keywords

Subject classification (UKÄ) – MANDATORY

  • Physical Sciences


  • fluorescence detection, fluorescence decay, He, double excitations, techniques
Original languageEnglish
Pages (from-to)39-42
JournalJournal of Electron Spectroscopy and Related Phenomena
Publication statusPublished - 2005
Publication categoryResearch