Multiple Auger decay following ionization-excitation of Ne I

The photoionization-excitation spectrum of Ne I, in which an electron in the 1s shell is ionized and the 2p orbital electron simultaneously excited to the np orbital, is investigated in detail for complex satellite states Ne+ 1s???12p???1(1,3P)np (n = 3, 4, 5, 6, 7). Then, the multiple Auger decay process is studied using the multistep method, including cascade, knock-out, and shake-off mechanisms, based on perturbation theory for the satellite states Ne+ 1s???12p???1(1,3P)np (n = 3, 4) with two holes. The major single Auger decay can be described as a spectator process that valence electrons remain in the original orbitals. For double Auger decay, direct and cascade processes are considered, in which the direct mechanism is dominated by the spectator process, while the cascade mechanism is mainly from the participator process. For triple Auger decay, the important contribution is from the process consisting of direct double Auger and the subsequent single Auger electron emissions. The calculated ion yields of Ne2+, Ne3+, and Ne4+ for multiple Auger process of satellite states Ne+ 1s???12p???1(1,3P)np (n = 3, 4) are consistent with experimental values [Hikosaka et al., Phys. Rev. A 97, 023405 (2018)].

Automated summary

This study focuses on the photoionization-excitation spectrum and multiple Auger decay process of Ne I. The spectrum analysis investigates complex satellite states Ne+ 1s???12p???1(1,3P)np (n = 3, 4, 5, 6, 7). The Auger decay process is studied using the multistep method, including cascade, knock-out, and shake-off mechanisms, for the satellite states Ne+ 1s???12p???1(1,3P)np (n = 3, 4) with two holes. The calculated ion yields of Ne2+, Ne3+, and Ne4+ are consistent with experimental values.