We have investigated the ejected-electron spectrum following impact excitation and ionization of laser-excited Na * (nl) atoms by 1.5 keV electrons. By means of two-laser excitation 3s → 3p 3/2 → 7d and subsequent cascading transitions about 8% (4%) of the target atoms were in excited states with n > 3 (7d). The experimental ejected-electron spectrum due to the decay of Auger and autoionization states of laser-excited atoms Na * (nl) with n = 4-7 has been fully interpreted by comprehensive calculations of the energies, cross sections and decay probabilities of the corresponding states. The various processes contributing to the ejected-electron spectrum are with decreasing magnitude: 2s ionization leading to 2s2p 6 nl Auger states, 2p → 3s excitation leading to 2p 5 3s( 1 P)nl autoionization states and 2s → 3l excitation leading to 2s2p 6 3l ( 1 L)nl autoionization states.

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The results of the own experimental and theoretical investigations of the long-lived photon echo (LPE) are reported. The special type of the resonant media, named as Van-Vleck paramagnetics (for example, LaF3:Pr3+), is used in our experiments. The physical mechanisms of LPE-forming are studied in these experiments. The various problems of the optical storage, using LPE, are discussed.