Excixtation of 1S and 3S Metastable Helium Atoms to Doubly Excited States

“Excixtation of ¹S and ³S  Metastable  Helium  Atoms to  Doubly Excited  States”

       M. Alagia, M. Coreno, H. Farrokhpour, P. Franceschi, A. Mihelič, A. Moise,     

        R.Omidyan, K.C. Prince, R. Richter,J. Soderstrom, S. Stranges, M. Tabrizchi, M.   

         Žitnik,  Phys. Rev. Lett., 153001 (102) 2009.

https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.102.153001