Line Identification of Atomic and Ionic Spectra of Holmium in the Visible Spectral Range. II. Spectrum of Ho II and Ho III

Abstract

Fourier Transform spectra of Holmium (Ho) in the visible spectral range from 14,280 up to 25,000 cm(-1), or 400 to 700 nm have been investigated, with a focus on the ionic lines. More than 500 spectral lines were assigned to singly ionized Ho (Ho II), of which more than 400 were previously unknown. A further 21 lines were assigned to doubly ionized Ho (Ho III), 1 of which was not reported previously. From among these lines, 60 Ho II lines and 20 Ho III lines were classified. A complete list of more than 4000 Ho lines observed in the recorded spectrum is supplied, even if they remain unclassified.