NIST Atomic Spectra Database

In summary, the NIST Atomic Spectra Database is a comprehensive collection of atomic energy levels, wavelengths, and transition probabilities for atoms and atomic ions. The data is collected from various sources and continuously validated for accuracy. It is freely accessible to the public and can be used for scientific research such as studying properties of atoms and ions, analyzing spectral lines, and improving spectroscopic instruments. However, there may be limitations to the data, such as not being exhaustive and varying accuracy for different elements and energy levels. Users should verify the data and consult other sources when necessary.
  • #1
lil1xal
1
0
Hello all,

What is mean the Ritz Wavelengths in the NIST Atomic Spectra Database?

Why the Ritz or Observed value for some Wavelength are very different?

Thanks,
Lil
 
Last edited:
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  • #2
See http://physics.nist.gov/PhysRefData/ASD/Html/lineshelp.html#OUTWAVELENGTH

The Ritz wavelengths are calculated from the difference in the energy levels involved in the transition, whereas the observed values are the experimental data. The accuracy of the Ritz wavelengths obviously depends on the accuracy of the calculated energy levels, and the accuracy of the observed values is limited by experimental precision, so some transitions can give quite different wavelengths.
 

1. What is the NIST Atomic Spectra Database?

The NIST Atomic Spectra Database is a collection of atomic energy levels, wavelengths, and transition probabilities for atoms and atomic ions. It is a comprehensive resource for researchers in the field of atomic and molecular spectroscopy.

2. How is the data in the NIST Atomic Spectra Database collected and validated?

The data in the database is collected from a variety of sources, including experimental measurements, theoretical calculations, and literature reviews. The accuracy of the data is continuously validated through comparisons with other databases and with new experimental results.

3. Can anyone access the NIST Atomic Spectra Database?

Yes, the database is freely available to the public through the NIST website. Users can search and download data for specific atoms or ions, as well as browse through the entire database.

4. How can the NIST Atomic Spectra Database be used in scientific research?

The database can be used to study the properties of different atoms and ions, to identify and analyze spectral lines in experimental data, and to aid in the development of theoretical models for atomic systems. It can also be used to calibrate and improve the accuracy of spectroscopic instruments.

5. Are there any limitations to the data in the NIST Atomic Spectra Database?

While the database contains a vast amount of data, it is not exhaustive and may not include all known energy levels and transitions for a given atom or ion. Additionally, the accuracy of the data may vary for different elements and energy levels. Users should always verify the data and consult other sources when necessary.

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