REVISED AND EXTENDED ANALYSES OF DOUBLY AND TREBLY IONIZED ARSENIC - AS-III, AS-IV

We photographed the spectrum of arsenic in the 300-1220-Angstrom-wavel ength region on a 3-m normal-incidence spectrograph, using a sliding s park and a triggered spark source. Earlier analyses of As III and As I v have been revised and extended. In the Pw III spectrum we have estab lished 40 new levels and classified 129 additional lines. In the As IV spectrum we have established 27 new levels and classified 100 additio nal lines. The parametric least-squares-fitted calculations have been carried out for the first time to our knowledge for these ions, and th ey satisfactorily interpret the observed spectra. (C) 1996 Optical Soc iety of America