The energy-level classifications for a few persistent lines are not known, as indicated by the absence of level values. The ionization energies are included except for a few spectra for which no reliable values are available. Meet Physics Open, the newest addition to Elsevier’s gold open access journal suite. For some spectra, especially some of the lighter elements, we have taken data from existing compilations that have been superseded by data reported in more recent literature.
These Aki values can easily be converted to oscillator strengths, fik, gifik, or log(gifik), or line strength, S, by using the following formula: where i refers to the lower energy level, k refers to the upper level, λ is the wavelength in Ångstroms, and g = 2J+1 for a given level.
Physics Open sits right beside your favourite physics journal(s), offering you an expert-led open access option. Our most extensive use of data from the original literature has been for the heavier elements. More complete data for a smaller number of the most persistent lines of each spectrum are given in additional tables for each element. The uncertainty in the relative position of two levels having different uncertainties is at least as large as the greater of the two level uncertainties. Although we have made heavy use of previous compilations, our tables for the great majority of elements include at least some data compiled by us from more recent original literature and, in some cases, from unpublished material. Check the status of your submitted manuscript in EES: The most downloaded articles from Atomic Data and Nuclear Data Tables in the last 90 days. For uniformity we have assigned an intensity of 1000 to the strongest line(s) of each spectrum. Most of the line characterizations in our tables are nist-quoted from [RCWM80], so that the characters given for lines of metallic elements usually pertain to the arc source used by Meggers et al. NIST, Physical Measurement Laboratory The periodic table contains NIST’s latest critically evaluated data for atomic properties of the elements. Atomic Data and Nuclear Data Tables presents compilations of experimental and theoretical information in atomic physics, nuclear physics, and closely related fields.
The uncertainty corresponding to a particular number of decimals may easily vary by an order of magnitude, however, even within the data for one spectrum.
Lines we have selected as persistent (Sec IV) are indicated by the letter "P" following the intensity.
We have not included or assigned such letters here, but this information is given in the NIST publications and in the ASD for all transition-probability values taken from these sources. D.C. Morton, Atomic Data for Resonance Absorption Lines (Part III), Astrophys. For data taken from the original literature or from non-NIST compilations, the user can consult the cited references for accuracy estimates.
Corliss, W.L. This form provides access to NIST critically evaluated data on atomic energy levels. Recently published articles from Atomic Data and Nuclear Data Tables. With a caveat that users should keep these considerations in mind, we list a relative intensity for each line. Your datasets will also be searchable on Mendeley Data Search, which includes nearly 11 million indexed datasets. 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.
0 - 2000 Å: 2000 - 2500 Å: 2500 - 2750 Å: 2750 - … Li Be B C N O F Ne, Na Mg Al Si P S Cl Ar, K Ca Sc Ti V Cr Mn Fe Co Ni Cu Zn Ga Ge As Se Br Kr, Rb Sr Y Zr Nb Mo Tc Ru Rh Pd Ag Cd In Sn Sb Te I Xe, Cs Ba La* Hf Ta W Re Os Ir Pt Au Hg Tl Pb Bi Po At Rn, Fr Ra Ac** For example, the current version of the ASD includes energy-level data for only two spectra (Mo I,II) of the 72 spectra of the neutral and singly-ionized atoms of the elements Rb to Ba (Z = 37-56) and Hf to Ra (Z = 72-88). NIST Atomic Spectra Database Levels Form. These intensities were obtained from observations of 10-A, 220-V direct-current arc discharges between copper electrodes having 0.1% of the element under investigation. We have attempted to give improved intensities for some spectra by using more recent and apparently more accurate data than those available to the compilers of [RCWM80]. An official website of the United States government. The journal is devoted to the publication of tables and graphs of general usefulness to researchers in both basic and applied areas. Cookies are used by this site. In spectroscopic observations made with low concentrations of a particular element relative to other substances in the source, the number of observable lines of the element is found to decrease with decreasing concentration until only the most "persistent" or "sensitive" lines remain. The relative intensities of the spectral lines observed for any element depend upon the light source and excitation conditions.
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