Revised and extended analysis of six-times ionized cesium: Cs VII

The spectrum of cesium was recorded in the 300-1240 A wavelength region on a 3 m normal incidence spectrograph using a triggered spark source. On the basis of these observations seventh spectrum of cesium (Cs VII) was investigated. Fortythree out of the possible fortyfive odd parity levels belonging to the 5s2np (n = 5, 6), 5p3, 5s5p5d, 5s5p6s and 5s2nf (n = 4, 5) configurations, and twenty eight out of the possible thirtyfive even parity levels belonging to the 5s5p2, 5s25d, 5s26s and 5s5p4f configurations were established. From the previous analyses, one level was rejected, two misprinted level values corrected and ten other levels were confirmed. One hundred and eightyfour (184) lines were classified in Cs VII spectrum out of which one hundred and sixty-nine (169) lines are new. Least squares fitted (LSF) and Hartree-Fock (HFR) calculations were carried out to interpret the spectrum adequately. (orig.)