Title: The Importance of Collisional Coupling among High-Energy Pseudometastable Levels of Fe <scp>ii</scp> Excited by Ly
Abstract:We study the effects of high-energy pseudometastable levels in modeling Fe II spectra excited by Lyα fluorescence. We demonstrate that collisional couplings between metastable- and radiative-emitting ...We study the effects of high-energy pseudometastable levels in modeling Fe II spectra excited by Lyα fluorescence. We demonstrate that collisional couplings between metastable- and radiative-emitting levels are of fundamental importance in the formation of the spectrum under a wide range of physical conditions that encompass most astronomical fluorescent Fe II sources. Electron-impact-induced transitions from metastable levels strengthen the overall emission spectra and, in particular, strengthen the lines that results from secondary decay after Lyα pumping, like the so-called "1 μm lines."Read More