Revised and extended analysis of five times ionized argon (Ar VI)

Abstract

R e v ise d and Exte nd e d A n a ly s is o f Five T im e s Ionized

Revised and Extended Analysis of Ar vi

“…In the present work, we used the LOPT (Kramida 2011) program to recalculate energy levels and study the uncertainties in wavelength measurements at VUV in this and our previous publications (Raineri et al 1992(Raineri et al , 2009. In this analysis, we consider all the lines shown in Table 1, excluding the transitions marked with the table footnote (j).…”

“…In our previous works, the line intensities for VUV were obtained under slightly different experimental conditions (Raineri et al 1992(Raineri et al , 2009. Here, we use line intensities from just one reference experiment, replacing previously published sets.…”

“…As used in our experiments, visual estimates of line intensities are historically good enough to classify transition arrays for groups of lines with close wavelengths emitted from the same higher level. Almost all Ar VI lines listed in ASD/NIST are measured on photographic plates and have their intensity determined by visual estimation (Phillips & Parker 1941;Fawcett et al 1978;Raineri et al 1992Raineri et al , 2009. However, the intensity recorded on a spectroscopic emulsion plate (we used Ilford Q2) depends on factors as diverse as photographic development conditions, diffraction grating reflectivity, slit aperture, plate sensitivity to wavelength and exposure time, and human decisions, among many others.…”

“…Our research group has studied the atomic spectra of noble gases in the Centro de Investigaciones Opticas laboratory in La Plata, Argentina, since the mid-1980s. Our first article on Ar VI was published in 1992 (Raineri et al 1992), containing 33 new line identifications. The second article came in 2009, and, at that time, we presented 68 new lines.…”

Study of the 4s4p4d and the 4s4p5s configurations of Kr VI

“…For the configurations that were not observed experimentally we used energy parameters fixed at the ratios described above. We spent most of our efforts on the odd-parity configurations, basing this study on our previous research on the spectrum of Ar VI, 28 in which we found the levels of the 3s3p3d and the 3s3p4s configurations. The calculations 4, but for even-parity configurations.…”