Abstract

Intensities of dispersed radiation in the region 500–3000A were measured with a compensated thermocouple mounted at the exit slit of a one-meter, normal incidence, vacuum monochromator. With 1-mm slits (17A band width), HeI at λ584 was found to be 0.025 microwatt over the exit slit. With a 1P21 tube coated with sodium salicylate and using 50-micron slits, the relative intensities of the first four members of the principal series of HeI at λ584, λ537, λ522, and λ516 were measured. The H2 spectrum from 850 to 3000A was also obtained with the thermocouple. The relative quantum efficiency of sodium salicylate was found to be constant in this spectral region and about 15 percent lower at λ584. Some of these measurements were made possible by a great increase of grating efficiency after an unintentional coating of the grating with a layer of evaporated platinum.

© 1953 Optical Society of America

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References

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1951 (4)

1946 (1)

1941 (1)

J. C. Boyce, Revs. Modern Phys. 13, 1 (1941).
[CrossRef]

1939 (1)

G. B. Sabine, Phys. Rev. 55, 1064 (1939).
[CrossRef]

1934 (3)

G. Dejardin and R. Schwegler, Rev. optique 13, 353 (1934).

G. Dejardin and R. Schwegler, Rev. optique 13, 313 (1934).

W. M. Powell, Phys. Rev. 45, 154 (1934).
[CrossRef]

1933 (1)

C. Kenty, Phys. Rev. 44, 891 (1933).
[CrossRef]

1930 (1)

W. E. Vaughan and W. A. Noyes, J. Am. Chem. Soc. 52, 559 (1930).
[CrossRef]

1926 (1)

Boyce, J. C.

J. C. Boyce, Revs. Modern Phys. 13, 1 (1941).
[CrossRef]

Dejardin, G.

G. Dejardin and R. Schwegler, Rev. optique 13, 353 (1934).

G. Dejardin and R. Schwegler, Rev. optique 13, 313 (1934).

Johnson,

Kenty, C.

C. Kenty, Phys. Rev. 44, 891 (1933).
[CrossRef]

Little, E. P.

Lock, C.

Noyes, W. A.

W. E. Vaughan and W. A. Noyes, J. Am. Chem. Soc. 52, 559 (1930).
[CrossRef]

Packer, D. M.

Pfund, A. H.

Powell, W. M.

W. M. Powell, Phys. Rev. 45, 154 (1934).
[CrossRef]

Purcell,

Watanabe, Purcell, and Tousey, , (1950);and Phys. Rev. 83, 792 (1951).
[CrossRef]

Richardson,

Sabine, G. B.

G. B. Sabine, Phys. Rev. 55, 1064 (1939).
[CrossRef]

Schwegler, R.

G. Dejardin and R. Schwegler, Rev. optique 13, 313 (1934).

G. Dejardin and R. Schwegler, Rev. optique 13, 353 (1934).

Toran,

Tousey,

Vaughan, W. E.

W. E. Vaughan and W. A. Noyes, J. Am. Chem. Soc. 52, 559 (1930).
[CrossRef]

Watanabe,

Johnson, Watanabe, and Tousey, J. Opt. Soc. Am. 41, 702 (1951).
[CrossRef]

Watanabe, Purcell, and Tousey, , (1950);and Phys. Rev. 83, 792 (1951).
[CrossRef]

Watanabe, K.

K. Watanabe, Phys. Rev. 83, 785 (1951).
[CrossRef]

J. Am. Chem. Soc. (1)

W. E. Vaughan and W. A. Noyes, J. Am. Chem. Soc. 52, 559 (1930).
[CrossRef]

J. Opt. Soc. Am. (5)

Phys. Rev. (4)

C. Kenty, Phys. Rev. 44, 891 (1933).
[CrossRef]

K. Watanabe, Phys. Rev. 83, 785 (1951).
[CrossRef]

W. M. Powell, Phys. Rev. 45, 154 (1934).
[CrossRef]

G. B. Sabine, Phys. Rev. 55, 1064 (1939).
[CrossRef]

Rev. optique (2)

G. Dejardin and R. Schwegler, Rev. optique 13, 353 (1934).

G. Dejardin and R. Schwegler, Rev. optique 13, 313 (1934).

Revs. Modern Phys. (1)

J. C. Boyce, Revs. Modern Phys. 13, 1 (1941).
[CrossRef]

Other (1)

Watanabe, Purcell, and Tousey, , (1950);and Phys. Rev. 83, 792 (1951).
[CrossRef]

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Figures (4)

F. 1
F. 1

(A) Tracing of a portion of the H2 spectrum obtained with a 1P21 coated with sodium salicylate, using 50-micron slits and scanning speed of 20A per minute. (B) Recorder tracing of the 584A line of HeI in the second order showing reversal. The recorder speed was about one-third of that used for (A).

F. 2
F. 2

Recorder trace of the thermocouple response of the H2 spectrum scanned at 100A per minute with 1-mm slits.

F. 3
F. 3

Spectral distributions of the H2 spectrum at the exit slit. Curve A and Curve B were obtained before and after the improvement of grating efficiency. Curve C is the result of Packer and Lock. Portions of Curve B, which crossed C, were omitted.

F. 4
F. 4

The relative quantum efficiency of sodium salicylate.