About project


In the work of many researchers occupies an important place to collect and analyze information on the properties of certain physical systems. In the case of gas or plasma systems, this information applies to the parameters of atoms and molecules, their performance on energy levels and transitions between them. Such information can be presented in tabular or graphical form.

The system enables a some main types of uses:
  • obtain information on levels of one or more elements in a tabular form. Currently, the system contains information on 92284 levels
  • obtain information on transitions of elements in a table form. Currently, the system contains information on 169201 transitions.
  • obtain graphical representation (Grotrian Charts) for a given element and a set of parameters

In atomic spectroscopy adopted the graphic form as diagrams Grotrian, whose main purpose - to give a visual representation of the structure of a single atom. In general form, the diagram Grotrian - a rectangle within which with lines of letters and numbers describe the electron structure of the atomic system: the position of energy levels, the main radiative transitions, quantum numbers. The top line gives the designation of all existing electronic configurations nlk for a given atom. The second - the symbols of the terms of the atomic residue in the third - terms of energy states of the atom in LS-, jj- or lj- ties. On vertical scales postponed, the energy of the states in cm-1 or eV. Inside the chart for each electronic state corresponds to a horizontal line is short and a number of quantum numbers. The states with the same orbital angular momentum l grouped in columns - s, p, d... They form a sequence converging to the boundary atom. Sloping lines with discontinuities displaying allowed transitions with wavelengths in angstroms.

The information system provides the user with necessary information, in tabular form or in graphical representation in the form of diagrams Grotrian, as well as provide it with ample mechanisms for sampling, filtering, sorting and tuning of the data. One of the goals is to use the system in education for training, which requires the inclusion of the full-text library of primary sources. As a result of a joint project NSU and IAE built an information system on the spectral properties of atoms and atomic ions.

At the core of information system is a database from various literary sources, and electronic resources. In contrast to the various analogs, this information system on the user's query provides both tabular and graphical representation of the atomic structure of all the chemical elements of the table D. Mendeleev. In addition to constructing a general Grotrian diagram displaying the most important (resonance) transitions and levels, the system provides a wide range of samples, including filtering and sorting levels and transitions, selective mapping of the Rydberg and autoionization states. In this respect, this information system is not inferior to its parameters known system NIST(USA).

Currently, information system contains the following spectral data: the value of the energy levels (93 units), known radiative transitions (90 items), the intensity of transitions, transition probabilities, oscillator strengths, lifetimes of levels, excitation cross sections. For each item, see the literary information on the reliability of data.

This information system is designed for scientists, engineers and students dealing with atomic spectroscopy, plasma physics, quantum electronics, astrophysics and related specialties.

The work is supported by RFBR project 05-07-90220-a