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Updated: Dec 26, 2025

Preparing an Isotopically Pure 229Th Ion Beam for Studies of 229mTh
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Proposed Secondary Wavelength Standards and Line Classifications in Thorium Spectra Between 0.9 and 3 m.

A Giacchetti1, J Blaise1, C H Corliss1

  • 1Institute for Basic Standards, National Bureau of Standards, Washington, D.C. 20234.

Journal of Research of the National Bureau of Standards. Section A, Physics and Chemistry
|March 20, 2020
PubMed
Summary

Researchers recorded the thorium spectrum using Fourier Transform Spectroscopy. The precise measurements of spectral lines are suitable for use as standard wavelengths in scientific applications.

Keywords:
Classified lines of Th i and Th iiFourier transform spectra of ThTh i and Th iiinfrared spectra of Thspectra of Ththorium spectrawavelengths of Th

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Area of Science:

  • Atomic physics
  • Spectroscopy

Background:

  • Accurate wavelength standards are crucial for spectroscopic analysis.
  • Thorium (Th) is an element with a complex atomic structure.

Purpose of the Study:

  • To record and classify the emission spectrum of thorium.
  • To assess the suitability of observed spectral lines as wavelength standards.

Main Methods:

  • Fourier Transform Spectroscopy (FTS) was employed to capture the thorium spectrum.
  • The spectrum was recorded from an electrodeless lamp in the 0.9 to 3 μm region.

Main Results:

  • Over 3100 spectral lines of thorium were observed.
  • Approximately 1900 lines were classified for Th I and 412 for Th II energy levels.
  • The average deviation between observed and calculated wave numbers was less than 0.002 cm⁻¹.

Conclusions:

  • The high precision of the observed wavelengths makes them suitable for use as standard wavelengths.
  • This work provides a valuable dataset for atomic physics research and metrology.