Atomic and Molecular Data

• Electron-Impact Cross Sections for Ionization and Excitation  

  Y.-K. Kim, K.K. Irikura, M.E. Rudd, M.A. Ali, and P.M. Stone

  This is a database primarily of total ionization cross sections of molecules by electron impact. The database also includes cross sections for a small number of atoms and energy distributions of ejected electrons for H, He, and H₂. The cross sections were calculated using the Binary-Encounter-Bethe (BEB) model, which combines the Mott cross section with the high-incident energy behavior of the Bethe cross section. Selected experimental data are included. Electron-impact excitation cross sections are also included for some selected atoms.

• Potential Energy Surface Database of Group II Dimer Molecules 

  S. Kotochigova and P. Julienne

  The purpose of this work is to provide critical atomic and molecular data needed in order to evaluate the feasibility of using laser cooled and trapped Group II atomic species (Mg, Ca, Sr, and Ba) for ultra-precise optical clocks or quantum information processing devices.

Nuclear Physics Data

• Radionuclide Half-Life Measurements Made at NIST

  M. P. Unterweger, D. D. Hoppes, and F. J. Schima

  This database is a table of the half lives of 65 important radionuclides measured primarily with ionization chambers by the Radioactivity Group of NIST. The included half lives range from 10 minutes to 60.7 years.

• Atomic Weights and Isotopic Compositions

  This database contains the isotopic compositions or abundances of those elements which have characteristic terrestrial compositions. Atomic weights and relative atomic masses are also available for elements 1 through 111.

Condensed Matter Physics Data

• Atomic Model Data for Electronic Structure Calculations

  Svetlana Kotochigova, Zachary Levine, Eric Shirley, Mark Stiles, and Charles Clark

  This database consists of evaluated data for use in total-energy calculations of electronic structure by density-functional theory. It contains total energies and orbital energy eigenvalues for all atoms from hydrogen to uranium, with micro-Hartree uncertainty in the total energy; as computed in the local-density approximation (LDA), the local-spin-density approximation (LSD), the relativistic local-density approximation (RLDA), and scalar-relativistic local-density approximation (ScRLDA).