Introduction of Atomic Spectra Database

     Data Structure: for each line, it contains the information of element, isoelectronic sequence (ionization degree), the transition wavelength (Å), the optical electron, the initial and final configurations and energy levels assignment, the transition probability (1/s), oscillator strength, method for data, reference and configuration description, etc.. The method for data means the method producing the data which includes the following four type: EXP (experimental data), THR (theoretical data), COMP (compiled data), SEMP (semi-empirical data). Only the predominant configuration is given for the initial and final states. For energy levels of complex configuration with multi-electron or multi-open-shell, the “configuration description” may be used to provide more information, such as the coupling style, the leading percentage, etc.. In some cases, for example, for the transition between two complicated levels, the optical electron is hard to be identified so this kind of information will not be issued.

    Instruction: There are six items for selection or input. One can retrieve the needed spectra data by specifying all of or at least one of the four items: element, isoelectronic sequence, range of wavelength and optical electron. If no selection is made for each item (e.g. element), all data (e.g. of all elements) will be retrieved. The searched results usually contain wavelength, the transition probability, oscillator strength etc., for some initial and/or final state, related information can be found in Atomic Energy Level Database.

    Status of Atomic Spectra Database: The atomic spectra database contains more than 2 millions lines, Part data came from the old version of the SPECTR database created by Multicharged-Ion Spectra Data Center of State Research Center VNIIFTRI in Russia.
   Many people contributed a lot to the database for many years, therefore the configuration and energy levels of some lines may not be labeled in a unified criterion. The standardization is in progress.

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