First observation of a photon-induced triply excited state in atomic lithium
Kiernan, L. and Kennedy, Eugene T. and Mosnier, Jean-Paul and Costello, John T. and Sonntag, B. (1994) First observation of a photon-induced triply excited state in atomic lithium. Physical Review Letters, 72 (15). pp. 2359-2362. ISSN 0031-9007
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Using a dual laser plasma technique we have measured for the first time the photoabsorption spectrum of atomic lithium at energies corresponding to the simultaneous excitation of both 1s electrons. We have observed the main triply excited 1s22s(2S)→2s2p(2P) transition with Fano parameters E0=142.32±0.05 eV Γ=0.20±0.04 eV, and q=-2.2±0.6. Our experiment represents the first step in photoionization studies of this fundamental atomic system in which the motion of the three electrons in the field of the nucleus is so highly correlated.
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