Analysis of the 3d9ns (n = 5, 6), 3d95p, 3d94f and 3d84s4p configurations of five times ionized arsenic (As VI)

Abstract

The spectrum of arsenic was photographed in the 100-1250 Å region on grazing and normal incidence spectrographs. The spectrum of As VI was extended. Seven out of eight levels of the 3d95s and 6s configurations, 12 out of 12 levels of the 3d95p configuration, 13 out of 20 levels of the 3d94f configuration and 35 levels belonging to the 3d84s4p configuration have been established. Least-Square-Fitted parametric calculations involving configuration interactions both in even and odd parity systems were carried out to adequately interpret the spectrum. One hundred and thirtytwo additional lines were classified in the As VI spectrum. A new value of the ionization limit was obtained. Thus, the 3d92D5/2 ground level in As VII lies 977 500 cm−1 (121.17 eV) above the As VI ground state.