Abstract

By employing three homologous spectrum lines, two in one wave-length range, and a third in the second wave-length range, it is possible to construct the two characteristic curves for heterochromous photometry. Spectra containing the three lines are recorded, at several levels of density, on the photographic emulsion to be calibrated. This provides data for a homochromous and a heterochromous preliminary curve. Calibration curves are constructed in the usual manner from these two preliminary curves.

© 1950 Optical Society of America

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References

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  1. G. H. Dieke, “Progress report on a study of standard methods for spectrographic analysis,” (October, 1944).
  2. R. A. Burdett and L. C. Jones, J. Anal. Chem. 19, 238 (1947).
    [Crossref]
  3. J. R. Churchill, Ind. Eng. Chem. Anal. Ed. 16, 653 (1944).
    [Crossref]

1947 (1)

R. A. Burdett and L. C. Jones, J. Anal. Chem. 19, 238 (1947).
[Crossref]

1944 (1)

J. R. Churchill, Ind. Eng. Chem. Anal. Ed. 16, 653 (1944).
[Crossref]

Burdett, R. A.

R. A. Burdett and L. C. Jones, J. Anal. Chem. 19, 238 (1947).
[Crossref]

Churchill, J. R.

J. R. Churchill, Ind. Eng. Chem. Anal. Ed. 16, 653 (1944).
[Crossref]

Dieke, G. H.

G. H. Dieke, “Progress report on a study of standard methods for spectrographic analysis,” (October, 1944).

Jones, L. C.

R. A. Burdett and L. C. Jones, J. Anal. Chem. 19, 238 (1947).
[Crossref]

Ind. Eng. Chem. Anal. Ed. (1)

J. R. Churchill, Ind. Eng. Chem. Anal. Ed. 16, 653 (1944).
[Crossref]

J. Anal. Chem. (1)

R. A. Burdett and L. C. Jones, J. Anal. Chem. 19, 238 (1947).
[Crossref]

Other (1)

G. H. Dieke, “Progress report on a study of standard methods for spectrographic analysis,” (October, 1944).

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Figures (4)

Fig. 1
Fig. 1

Preliminary curves in 2700A region. Two sets of homologous lines are employed because the data of one set was not sufficient to cover the entire density range desired.

Fig. 2
Fig. 2

Characteristic calibration curves for 2700A and 4200A wave-length regions arranged for heterochromous photometry. The paired numbers are transmittance values for which spectral lines at 2700A and 4200A have equal intensity and hence the same abscissa. The upper number of each pair corresponds to the 2700A region and the lower to the 4200A region. These numbers are derived from the heterochromous preliminary curve shown in Fig. 3. This data permits the construction of the characteristic curve for the wave-length region at 4200A.

Fig. 3
Fig. 3

Heterochromous preliminary curve for 2700A and 4200A wave-length region. FeI 2750.14 and FeI 4271.76 are employed as homologous pair. It is assumed that the intensity ratio of this line pair is one. Transmittance values for which the heterochromous pair have equal intensities are tabulated at right and are taken from the curve.

Fig. 4
Fig. 4

Preliminary curve 4200A region. Used to check the accuracy of the characteristic curve of the 4200A region derived from the heterochromous preliminary curve of Fig. 3. All points of this preliminary curve give an approximate intensity ratio of 1.62 when measured from the dotted curve of Fig. 2, thus, indicating good agreement.