IDEN2 - A program for visual identification of spectral lines and energy levels in optical spectra of atoms and simple molecules
Abstract The article describes a Java program that can be used in a user-friendly way to visually identify spectral lines observed in complex spectra with theoretically predicted transitions between atomic or molecular energy levels. The program arranges various information about spectral lines and energy levels in such a way that line identification and determination of positions of experimentally observed energy levels become much easier tasks that can be solved fast and efficiently. Program summary Program title: IDEN2 Program Files doi: http://dx.doi.org/10.17632/mwr2tk84sw.1 Licensing provisions: GPLv3 Programming language: Java v.1.8 Nature of problem: Line identification problem in atomic and molecular spectra that have a limited number of previously known low-excited energy levels and a large number of unidentified spectral lines (emission or absorption). The line identification consists of finding the lower and upper energy levels of transitions corresponding to each observed spectral line. Solution method: For each energy level (experimentally known or unknown), the list of observed spectral lines is displayed on a wavenumber scale as an image. This image is repeated with certain vertical shifts in several columns corresponding to other levels connected with the investigated one by theoretically predicted transitions. In each such column, the image of the line spectrum is shifted by the value corresponding to the energy of the connecting level. Then the problem of location of an unknown level is reduced to scrolling the screen until several spectral lines in different columns align along the same horizontal line. Various gadgets provide complete information about all pertinent entities, such as the level identities, wavelengths, observed and calculated intensities. Additional comments including restrictions and unusual features: A practical limitation on the size of the problem is imposed by the available RAM, which is typically sufficient to treat spectra with up to 100 000 spectral lines and 10 000 energy levels. The visual appearance of all gadgets, including font sizes, colors, and window sizes and positions, is completely customizable. An extensive Help system and User Guide are included.
The 4d8nf (n = 5 and 6) and 4d87p configurations in the spectrum of four times ionized indium (In V)
Abstract The spectrum of the In+4 ion was studied in the region below 222 A. The 4d9 – (4d8nf (n > 4) + 4d8np (n > 6)) transitions were analyzed. 74 spectral lines of the transitions from the levels of the 4d85f, 4d86f and 4d87p configurations were identified. Previous analysis of the 4d9 − 4d8 (5f + 7p) transitions was revised.
Configuration mixing in singly-ionized platinum group elements. I, Low odd configurations of Hf II, Ta II and W II
The odd energy levels of Hf II, Ta II and W II have been investigated by means of the Slater-Condon parametric method. This led us to elimination of fortuitous levels reported in earlier analyses, to revision of J-values and the finding of 23 new levels in Ta II. The configuration mixing is very strong in the groups 5dN−16s6p + 5dN−26s6p + 5dN−36s26p, the latter configuration being generally unrecognizable. Very few low odd levels are still unknown in these spectra.