The photoabsorption spectrum of laser-generated Li+ in the 60-190 eV proton energy range

The relative photoabsorption cross-section of the Li+ atomic ion was measur ed using the dual laser plasma photoabsorption technique. The measurements were carried out in the photon energy range from 62 eV (1s2p discrete reson ance) up to 190 eV, i.e. about two-and-a-half times the value of the first ionization potential(I-1 75.64 eV). In the continuum, the relative photoabs orption data (with an estimated uncertainty of +/-14%) are normalized to th e theoretical photoionization cross-section, given in analytical form by Ve rner et al (Verner D A, Ferland G J, Korista K T and Yakovlev D G 1996 Astr ophys. J. 465 487). Comparisons between calculated photoionization cross-se ctions and with relevant experimental data are presented.