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Version 5

Welcome to the NIST Atomic Spectra Database, NIST Standard Reference Database #78. The spectroscopic data may be selected and displayed according to wavelengths or energy levels by choosing one of the following options:

Spectral Lines    Spectral lines and associated energy levels displayed in wavelength order with all selected spectra intermixed or in multiplet order. Transition probabilities for the lines are also displayed where available.
Energy Levels    Energy levels of a particular atom or ion displayed in order of energy above the ground state.

Ground States and Ionization Energies 
Ground states and ionization energies of atoms and atomic ions.

Additional information about the database may be obtained through the following links:

Atomic Spectroscopy Intro   Outlines basic atomic physics concepts, explains terminology and notation.
ASD Intro & Contents
  Introduction to and contents of the Atomic Spectra Database.
Bibliography   Bibliography of data sources used for this database.
Help   On-line help in using the database.

This database provides access and search capability for NIST critically evaluated data on atomic energy levels, wavelengths, and transition probabilities that are reasonably up-to-date. The Atomic Spectroscopy Data Center has carried out these critical compilations. The Data Center is located in the Physical Measurement Laboratory at the National Institute of Standards and Technology (NIST).

©1979, 1980, 1981, 1982, 1983, 1985, 1988, 1990, 1991, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2005, 2006, 2007, 2008, 2010, 2011, 2012, 2013, 2014 - copyright by the U.S. Department of Commerce on behalf of the United States. All rights reserved.
NIST reserves the right to charge for these data in the future.

NIST Standard Reference Database 78
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Online: March 1995 - Last update: October 2015

This database was funded [in part] by the Office of Fusion Energy Sciences of the U.S. Department of Energy, by the National Aeronautics and Space Administration, by NIST's Standard Reference Data Program (SRDP), and by NIST's Systems Integration for Manufacturing Applications (SIMA) Program.
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Principal Developers (Currently Active):
Alexander Kramida, Yuri Ralchenko, and Joseph Reader

Data Compilers
(Currently Active):
Alexander Kramida, Edward B. Saloman

Database Developers (Currently Active):
Alexander Kramida, Yuri Ralchenko, and Karen Olsen

Students contributing to data entry:
Eric Carpentier, Thomas Carpentier, Amy Zimmerman, Adrian Hamins-Puertolas, Marko Hamins-Puertolas, Anna Sharova, Genevieve Tan

Past Contributors
Jean E. Sansonetti, Jeffrey R. Fuhr, Larissa I. Podobedova, Wolfgang L. Wiese, John J. Curry, Gerry R. Dalton, Robert Dragoset, Fun-Chen (Jesse) Jou, William C. Martin, Peter J. Mohr,  Arlene Musgrove, Craig J. Sansonetti, and Gloria Wiersma

Other NIST Atomic Spectroscopic Data:
Handbook of Basic Atomic Spectroscopic Data

Energy Levels of of Hydrogen and Deuterium

Ultraviolet Spectrum of Platinum Lamp

Spectrum of Th-Ar Hollow Cathode Lamps

X-ray Transition Energies

Bibliographic Databases

Yuri Ralchenko, Leader
Atomic Spectroscopy Group
301-975-3210 Telephone
301-990-1350 Facsimile

100 Bureau Drive, M/S 8422
Gaithersburg, MD 20899-8422