Abstract

A method has been developed for finding the half-intensity width, to an accuracy of ±5%, of the profiles of spectral lines photographed in the vacuum ultraviolet. Plate calibration is achieved by an aperture restriction device placed at the Sirks focus of a 3-meter normal incidence vacuum spectrograph. This gives a stepped intensity in the focal plane with a standard ratio of 2:1. The measurement is not affected by reciprocity law failure or intermittency effect in the photographic emulsion, and can be used with pulsed light sources.

© 1962 Optical Society of America

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References

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  1. E. P. Butt et al., Proc. 2nd Intern. Conf. Peaceful Uses Atomic Energy, Geneva, 15/P/1519 (1958).
  2. G. N. Harding et al., Proc. 2nd Intern. Conf. Peaceful Uses Atomic Energy, Geneva, 15/P/1520 (1958).
  3. B. B. Jones, R. Wilson, Conf. on Controlled Nuclear Fusion, Salzburg, 1961.
  4. J. L. Sirks, Astron. and Astrophys. 13, 763 (1894).
  5. R. A. Sawyer, Experimental Spectroscopy (Prentice-Hall, Englewood Cliffs, New Jersey, 1944), p. 136.

1894

J. L. Sirks, Astron. and Astrophys. 13, 763 (1894).

Butt, E. P.

E. P. Butt et al., Proc. 2nd Intern. Conf. Peaceful Uses Atomic Energy, Geneva, 15/P/1519 (1958).

Harding, G. N.

G. N. Harding et al., Proc. 2nd Intern. Conf. Peaceful Uses Atomic Energy, Geneva, 15/P/1520 (1958).

Jones, B. B.

B. B. Jones, R. Wilson, Conf. on Controlled Nuclear Fusion, Salzburg, 1961.

Sawyer, R. A.

R. A. Sawyer, Experimental Spectroscopy (Prentice-Hall, Englewood Cliffs, New Jersey, 1944), p. 136.

Sirks, J. L.

J. L. Sirks, Astron. and Astrophys. 13, 763 (1894).

Wilson, R.

B. B. Jones, R. Wilson, Conf. on Controlled Nuclear Fusion, Salzburg, 1961.

Astron. and Astrophys.

J. L. Sirks, Astron. and Astrophys. 13, 763 (1894).

Other

R. A. Sawyer, Experimental Spectroscopy (Prentice-Hall, Englewood Cliffs, New Jersey, 1944), p. 136.

E. P. Butt et al., Proc. 2nd Intern. Conf. Peaceful Uses Atomic Energy, Geneva, 15/P/1519 (1958).

G. N. Harding et al., Proc. 2nd Intern. Conf. Peaceful Uses Atomic Energy, Geneva, 15/P/1520 (1958).

B. B. Jones, R. Wilson, Conf. on Controlled Nuclear Fusion, Salzburg, 1961.

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Figures (4)

Fig. 1
Fig. 1

Aperture restriction device placed before the entrance slit of the spectrograph to produce a stepped intensity distribution in the final image with a ratio of 2:1.

Fig. 2
Fig. 2

Construction for the horizontal image position (XX) at the Sirks focus of a concave grating spectrograph. The aperture limiter is placed at XX on the tangent at P. S, entrance slit; G, concave grating; NP, grating normal; P, image on Rowland circle.

Fig. 3
Fig. 3

A section of a characteristic curve for Ilford Q.2 emulsion, constructed using the aperture limiter and the O VI resonance doublet λ 1031 Å, λ 1037 Å, photographed in the Zeta spectrum. The composite curve was obtained by superimposing the parts given by exposures 2 and 3 on exposure 1. ×, exposure 1; □, exposure 2; △, exposure 3; ●, superimposed points.

Fig. 4
Fig. 4

Part of the Zeta spectrum in the vacuum ultraviolet, using oxygen and argon as trace elements in a deuterium discharge, illustrating the stepped intensity distribution in the spectral lines.

Tables (1)

Tables Icon

Table 1 Observed Peak Intensity Ratios for the Resonance Doublets of O VI, Ne VIII, and A VIII Measured Photographically with the Aperture Limiter, and Photoelectrically

Equations (2)

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I = I 1 + I 2 .
D ( I 2 ) = D ( I 1 + I 2 2 ) = 1 2 [ D ( I 1 ) + D ( I 2 ) ] for I 1 I 2 .

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