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 4d 8 –(4d 7 4f + 4d 7 6p + 4p 5 4d 9 ) transitions in the spectrum of five times ionized indium (In VI)
Abstract The spectrum of five times ionized indium excited in a vacuum spark has been studied in the wavelength region 180−250 A using a 3 m grazing incidence spectrograph. Transitions from highly excited interacting configurations 4d74f + 4d76p + 4p54d9 to the ground state 4d8 configuration were studied. 165 spectral lines were identified and 81 levels of the excited configurations were found.
Fine-structure analysis of the (5d+6s)5 levels of Ta I
The fine structure of the prominent even levels of the neutral tantalum atom has been analyzed by simultaneous parametrization of one- and two-body interactions for the model space (5d+6s)5. The analysis was stimulated by the current discovery of several energy levels. It was possible to clear the configurations and designations of the energy levels given in commonly used tables. Magnetic-dipole hyperfine interaction constants A and electric-quadrupole hyperfine interaction constants B were calculated using the calculated eigenfunctions and adjusting radial integrals in a least-squares procedure which compares the calculated Aand B-constants with the experimental values. The rms error of this fitting procedure confirms the quality of the fine structure analysis. Moreover, wavenumbers and hyperfine constants of 52 further levels, up to now unidentified, are predicted.