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Journal of the Optical Society of America

Journal of the Optical Society of America

  • Vol. 60, Iss. 4 — Apr. 1, 1970
  • pp: 474–489

Proposed Secondary-Standard Wavelengths in the Spectrum of Thorium

A. GIACCHETTI, R. W. STANLEY, and R. ZALUBAS  »View Author Affiliations


JOSA, Vol. 60, Issue 4, pp. 474-489 (1970)
http://dx.doi.org/10.1364/JOSA.60.000474


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Abstract

Energy levels for Th I were computed from the weighted averages of wavelengths from seven sets of published interferometrically measured data. The most self-consistent energy levels obtained in this way were then employed to calculate wavenumbers that have a standard deviation of less than 10 mK. We propose that these lines be adopted as class-B secondary standards. Calculated wavelengths of 1375 Th I lines and weighted averages of 181 interferometrically measured Th I and Th II lines between 2565 and 12 381 Å are given.

Citation
A. GIACCHETTI, R. W. STANLEY, and R. ZALUBAS, "Proposed Secondary-Standard Wavelengths in the Spectrum of Thorium," J. Opt. Soc. Am. 60, 474-489 (1970)
http://www.opticsinfobase.org/josa/abstract.cfm?URI=josa-60-4-474

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