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Journal of the Optical Society of America

Journal of the Optical Society of America

  • Vol. 33, Iss. 8 — Aug. 1, 1943
  • pp: 425–432

The Use of Iron Lines as Intensity Standards

G. H. DIEKE and H. M. CROSSWHITE  »View Author Affiliations

JOSA, Vol. 33, Issue 8, pp. 425-432 (1943)

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Groups of iron lines with relative intensities independent of excitation are proposed to serve as intensity standards for rapid and reliable plate calibration. One such group between 3140 and 3240A has been tested under a great variety of conditions and found to be satisfactory for this purpose. Lines of Fe I selected at random in general have their relative intensities changed much more by self-reversal than by changes in excitation. A general quantitative study of self-reversal was made which allows an estimate of the degree of self-reversal of any line under given conditions. Weak or moderately strong lines coming down to all but the lowest levels are free from self-reversal under the conditions at which arcs or sparks are usually operated.

G. H. DIEKE and H. M. CROSSWHITE, "The Use of Iron Lines as Intensity Standards," J. Opt. Soc. Am. 33, 425-432 (1943)

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  1. H. H. Grossmann, R. A. Sawyer, and H. B. Vincent, J. Opt. Soc. Am. 33, 183 (1943). R. A. Sawyer and H. B. Vincent, ibid. 33, 247 (1943). The latter paper appeared while the present article was in press.
  2. K. Burns and F. H. Walters, Pub. Allegheny Obs. 6, 159 (1929); 8, 43 (1931).
  3. Imperfect control of the primary calibration in the earlier experiments has caused the values of the intensities given in Table I to be slightly different from later values when these imperfections had been eliminated. This, however, has no influence on the comparison of the values taken under different conditions. Only the intensity scale used is different from the true one.
  4. See, e.g., R. Frerichs, Ann. d. Physik 81, 807 (1926); J. B. van Milaan, Zeits. f. Physik 34, 921 (1925).
  5. G. R. Harrison, J. Opt. Soc. Am. 17, 389 (1928); G. R. Harrison and H. Engwicht, J. Opt. Soc. Am. 18, 287 (1929).
  6. A simple consideration shows that in calculating the optical path length d we must disregard the a priori probability (2J+1) in the number of atoms. This factor is taken care of in I0. This can be easily seen if the J degeneracy is first removed (e.g., by a magnetic field).
  7. The scattering of the points in general is not due to accidental errors of measurement, but due to the fact that a fairly large wave-length interval was covered for which both the sensitivity and the contrast of the plate changed, which changes were not taken into account in the plate calibration.
  8. S. Levy, J. App. Phys. 11, 480 (1940).

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