Selected Links:

This section presents several links to many sites useful for spectroscopy and radiation applications.

• Spectral Databases

  • NIST Database Contains data for radiative transitions and energy levels in atoms and atomic ions. Data are included for observed transitions of 99 elements and energy levels of 52 elements. ASD contains data on about 900 spectra from about 1 A (Angstroms) to 200 µm (micrometers), with about 70,000 energy levels and 91,000 lines, 40,000 of which have transition probabilities listed. The most current NIST-evaluated data associated with each transition are integrated under a single listing.
  • TOPbase TOPbase is a read-only database system specially designed for general use of the OP atomic data. It contains energy levels, f-values and photoionization cross sections for astrophysically abundant elements. The software tool is an attempt to provide a suitable and uniform framework capable of offering:
    • The possibility of intensive use of the OP atomic data
    • Access to a complete and accurate dataset
    • Transparency for a wide range of computational platforms
    • Time and space efficiency
    • Low cost.
    The present TOPbase version (0.6) has been specifically developed for interactive use of the data, and allows the ftp of selected data files. It contains data for ions with the following atomic and electron numbers:
    • NZ=1-14; NZ=16; NZ=18; NZ=20; NZ=26
    • NE=1-24 (where for any ion NE .LE. NZ)
    It can load in main memory at any time up to 250K records (e-levels or f-values) and up to 500K photoionization-cross-section points.
    
  • HITRAN Database HITRAN is an acronym for high-resolution transmission molecular absorption database. HITRAN is a compilation of spectroscopic parameters which a variety of computer codes use to predict and simulate the transmission and emission of light in the atmosphere. The database is a long-running project started by the Air Force Cambridge Research Laboratories (AFCRL) in the late 1960's in response to the need for detailed knowledge of the infrared properties of the atmosphere. The HITRAN compilation, and its analogous database HITEMP (high-temperature spectroscopic absorption parameters), are now being developed at the Atomic and Molecular Physics Division, Harvard-Smithsonian Center for Astrophysics under the continued direction of Dr. Laurence S. Rothman.
    
  • GAPHYOR Database Database on properties of atoms, molecules and neutral or ionized gases, including chemical reactions. Five domains of physics, chemical physics and plasma physics are dealt with:
    • Properties of isolated atoms and molecules.
    • Collisions with photons.
    • Collisions with electrons.
    • Collisions and reactions between atoms and molecules.
    • Macroscopic properties of gases
    
    GAPHYOR is based on a large coverage of the specialized literature in the fields of atomic and molecular physics, chemical physics and plasma physics. After a detailed analysis of papers by a team of scientific experts the information is coded and indexed in a concise and structured way. Data include bibliographical, factual and numerical information.
    
  
  

• Other Links

  • DiREF For some years now the authors have been compiling references related to the spectra of diatomic molecules. The ultimate (but still distant) goal is to up-date Huber and Herzberg's classic book on the constants of diatomic molecules. This work is based largely on the Berkeley Newsletters, which contain references to papers on the spectra of diatomic and small polyatomic molecules. DiRef (short for Diatomic Reference Database) currently consists of about 30,000 references covering the period 1974-2000. DiRef contains all of the diatomic references from the Berkeley Newsletters from these years, corrected if necessary, and with some additional citations. The starting year was chosen to ensure adequate overlap with the references found in Huber and Herzberg. The authors endeavor to keep DiRef current through up-dates several times per year.