Investigation of the influence of inner-shell photoionization and photoexcitation on the Heα spectrum in photoionized plasmas

Abstract The present paper investigates the influence of inner shell photoionization and photoexcitation on the He α , i.e., the 1 s 2 to 1 s 2 p transition in He-like ions, and the associated satellite spectra in photoionized plasmas. A comparison of the importance of these processes is made relative to other atomic processes as a function of the electron temperature and irradiation conditions. For the formation of the He α and the satellite spectra, the K-shell photoionization is found to have significant contribution under low radiation temperature and/or intensity, when lithium- and beryllium-like ions have high abundance, but highly ionized H-like ions are rare.