The spectrum of barium was recorded in the 250–1240-Å region on a variety of spectrographs. The sources used were a conventional triggered spark and a laser-produced plasma. The spectrum of seven-times ionized barium was investigated. Eight of thirteen levels reported earlier were confirmed. In the present analysis we have established a total of 74 levels, 66 of them new, belonging to the 5s<sup>2</sup>5p, 5s<sup>2</sup>4f, 5p<sup>3</sup>, 5s5p5d, 5s<sup>2</sup>6p, 5s<sup>2</sup>5f, and 5s5p6s configurations in the odd-parity system and to the 5s5p<sup>2</sup>, 5s<sup>2</sup>5d, 5s5p4f, and 5s<sup>2</sup>6s configurations in the even-parity system. We carried out least-squares fitted and Hartree–Fock calculations to interpret the spectrum satisfactorily. One hundred thirty-nine lines have been classified in this spectrum, of which one hundred thirty are newly classified lines.
© 2001 Optical Society of America
S. S. Churilov, Y. N. Joshi, and R. Gayasov, "Analysis of seven-times-ionized barium: Ba VIII," J. Opt. Soc. Am. B 18, 113-120 (2001)