Activities at the Atomic Spectroscopy Data Center at the National Institute of Standards. Wolfgang L. Wiese Atomic Spectroscopy Group, NIST
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1 Activities at the Atomic Spectroscopy Data Center at the National Institute of Standards and Technology (NIST) Wolfgang L. Wiese Atomic Spectroscopy Group, NIST
2 The NIST Atomic Spectroscopy Data Center Data Center Area Principal Scientist Staff a. Atomic Energy Levels and Wavelengths b. Atomic Transition Probabilities c. Spectral Line Shapes and Shifts d. Database Design and Expansion e. Bibliographical Databases J. Reader E. Saloman, C. Sansonetti, W. Martin, J. Sansonetti, A. Kramida W. Wiese D. Kelleher, L. Podobedova, J. Fuhr W. Wiese No permanent workforce; Occasional contractors, guest scientists, collaborations Y. Ralchenko, A. Kramida A. Kramida R. Ibacache
3 NIST Spectroscopic Databases on the World Wide Web (address: 1. Annotated Bibliographic databases: Transition probabilities, Line Widths and Shifts, Energy levels and wavelengths,
4 NIST Spectroscopic Databases on the World Wide Web Continued 2. Numerical databases: (a) Atomic Spectra Database (ASD), Version This is a new, greatly expanded database covering spectroscopic reference data for all chemical elements. Light elements up to Cu (Z = 29) are covered for most states of ionization, heavier elements are usually represented by neutral atoms and low stages of ionization. Version (2005) 120,400 wavelengths 75,700 energy levels 44,200 transition probabilities 930 spectra Version (2007) 143,800 wavelengths 77,100 energy levels 60,500 transition probabilities 947 spectra Version (2009) 150,000 wavelengths 80,000 energy levels 66,000 transition probabilities
5 NIST Spectroscopic Databases on the World Wide Web Continued (b) (c) (d) (e) Handbook of Basic Atomic Spectroscopic Data (updated, including energy level diagrams) Spectral Data for the Chandra X ray Observatory Ground Levels and Ionization Energies for Neutral Atoms (updated) X ray Transition Energies plus related Atomic and Molecular Physics Databases
6 The NIST Reference Data Program The NIST Atomic Spectroscopy Data Center puts considerable effort into critical assessment of numerical data. Only one numerical value is presented for each quantity. This may be either from a single source, evaluated as being the most accurate one, or from an average of several sources of about equal reliability. For atomic transition probabilities (oscillator strengths), explicit accuracy ratings are given. For wavelengths and atomic energy levels, the number of tabulated digits indicate the accuracy. NIST data tables are limited to REFERENCE data, i.e., data of certain minimum quality.
7 Critical Spectroscopic Data Compilations Completed During (all published in the Journal of Physical and Chemical Reference Data) a) Atomic Energy Levels and Wavelengths: (Compilers: A. Kramida, J. Reader, E. Saloman, J. Sansonetti, T. Shirai, J. Sugar) Sodium: Potassium: Gallium: Krypton: Na I through Na XI K I through K XIX Ga I through Ga XXXI Kr I through Kr XXXVI
8 b) Atomic Transition Probabilities: (Compilers: J. Fuhr, D. Kelleher, L. Podobedova, J. Sansonetti, W. Wiese) Hydrogen: Helium: Lithium: Carbon: Nitrogen: Sodium: Magnesium: Aluminum: Silicon: Sulphur: Potassium: H I, D I, T I He I, He II Li I through Li III C I, C II N I, N II Na I through Na XI Mg I through Mg XII Al I through Al XIII Si I through Si XIV S I through S XVI K I through K XIX
9 Major Spectroscopic Data Compilations in Press or Nearing Completion a) Atomic Energy Levels and Wavelengths: (Compilers: A. Kramida, L. Podobedova, E. Saloman, J. Sansonetti) Neon: Ne IV Chlorine: Cl V XVII Argon: Ar I Ar XVIII Cesium: Cs I Cs LV Barium: Ba III Ba LVI b) Atomic Transition Probabilities: (Compilers: J. Fuhr, D. Kelleher, L. Podobedova, J. Sansonetti, W. Wiese) Beryllium: Be I Be IV Boron: B I B V Chlorine: Cl I Cl XVII Argon: Ar II Ar XVIII Cesium: Cs I Cs LV Barium: Ba III Ba LVI
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18 Progress on the NIST Databases Bibliographic databases are integrated with the Atomic Spectra Database, the principal numerical database of NIST. The Atomic Spectra Database is being updated with the recent numerical material from various NIST compilations. A completely new version of the Atomic Spectra Database is nearing completion (version 4).
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22 The NIST Reference Data Program The NIST Atomic Spectroscopy Data Center puts considerable effort into critical assessment of numerical data. Only one numerical value is presented for each quantity. This may be either from a single source, evaluated as being the most accurate one, or from an average of several sources of about equal reliability. For atomic transition probabilities (oscillator strengths), explicit accuracy ratings are given. For wavelengths and atomic energy levels, the number of tabulated digits indicate the accuracy. NIST data tables are limited to REFERENCE data, i.e., data of certain minimum quality.
23 Comparison of transition probability data from two sophisticated multi configuration calculations for C II (CIV 3 and MCHF). The MCHF results were selected. log gf (Correge & Hibbert, CIV 3) log gf (MCHF) log gf (MCHF)
24 Comparison of advanced multi configuration (MCHF) calculations with recent emission experiments for some transition probabilities of N I. The MCHF results were selected.
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Chapter 6 In a self-service store, the products are grouped according to similar characteristics. With a logical classification system, finding and comparing products is easy. You will learn how elements
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