Skip to main content

Search datasets

#1 Federal
NIST Atomic Weights and Isotopic Compositions with Relative Atomic Masses
- Organization: National Institute of Standards and Technology
- Dataset Last Updated: July 01, 2010
The atomic weights are available for elements 1 through 118 and isotopic compositions or abundances are given when appropriate. Version 3.0.
- html
Search relevance: 1.00 | Views last month: 31 | Catalog Last Checked: August 03, 2026 at 03:49 AM
#2 Federal
NIST Handbook of Basic Atomic Spectroscopic Data - SRD 108
- Organization: National Institute of Standards and Technology
- Dataset Last Updated: August 01, 2005
This handbook provides a selection of the most important and frequently used atomic spectroscopic data in an easily accessible format. The compilation includes energy levels, ionization energies,...
- html
Search relevance: 1.00 | Views last month: 8 | Catalog Last Checked: August 03, 2026 at 03:49 AM

Filter selections are applied on each click

Looking for U.S. government information and services?

Visit USA.gov