1 The calculated results show that autoionization rates varies regularly with the effect of spectator electron.

2 For bound states, three-step autoionization detection method and direct photoionization detection method are employed.

3 In this paper, the two-photon autoionization involving second-order ionization process under strong laser field is investigated.

4 This paper describes the investigation of even-parity autoionization states of cerium atoms by three-step three-color resonance ionization spectroscopy (RIS).

5 In this paper, the two-photon autoionization involving second-order ionization processes is investigated.

6 It is shown that autoionization will make processes of above-threshold ionization more complicated and a lot of new effects will appear.

7 Autoionization rates and dielectronic capture strengths of two other high-Z elements Au and Ta for comparison are also calculated.

8 This experiment technique provides a new method to study high J Rydberg states and autoionization state of atom.

9 Detailed studies have been carried out to demonstrate the effects of the autoionization resonances on the radiative opacity and transmission.

10 In the photon-energy region between and ionization thresholds of autoionization due to the doubly -excited states, there are five Rydberg series coupling strongly to each other.

11 The experimental results are classified and discussed in detail in the light of different autoionization channels.

12 The above achievements have important academic values for enhancing the knowledge about atomic autoionization process.