Photographing Spectra in the Vacuum Ultraviolet*

A. L. Schoen; Edwin S. Hodge

doi:10.1364/JOSA.40.000023

Journal of the Optical Society of America
Vol. 40,
Issue 1,
pp. 23-28
(1950)
•https://doi.org/10.1364/JOSA.40.000023

Photographing Spectra in the Vacuum Ultraviolet

A. L. Schoen and Edwin S. Hodge

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A. L. Schoen and Edwin S. Hodge, "Photographing Spectra in the Vacuum Ultraviolet*," J. Opt. Soc. Am. 40, 23-28 (1950)

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Abstract

Sensitive materials for photographing the far-ultraviolet spectrum usually require either a fluorescent overcoating on the emulsion or a sensitive silver halide layer containing a low concentration of gelatin on the surface. The characteristics of a new photographic material of the latter type are described. Tests indicate that the new emulsion has higher sensitivity, greater contrast, lower fog, and is processed by a simpler procedure than previously available materials. The absorption effect of gelatin is shown.

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		Average gradient S.W.R.		Relative speed (R.S.) S.W.R.
		103–O U.V.-Sens.		103–O U.V.-Sens.
Wave-length	Elements	${\bar{G}}_{0.3}^{1.0}$	${\bar{G}}_{0.3}^{1.0}$	R.S._D_=0.3	R.S._D_=1.0
553.3	O IV	1.8	0.80	3.9	12.7
629.7	O V	1.8	0.95	4.3	8.2
758.6	O V	1.8	0.95	4.5	11.0
833.7	O III	1.8	0.91	3.1	7.8
921.9	N IV	2.0	0.95	3.2	7.7
1242.7	N V	2.1	0.99	1.9	4.2
1343.5	O IV	2.2	0.94	1.2	4.9
1730.0	N III	2.4	0.90	0.8	3.1
1885.2	N III	2.3	0.90	0.6	1.1
103–O U.V.-Sensitized Film
1885.2	N III	2.0	0.71	1.4	4.5
1920.8	N III	2.1	0.71	1.3	7.2
2128.1	Si IV	2.3	0.80	1.5	5.5
2297.8	C III	1.8	0.70	1.0	4.9
2391.1	O III	1.6	0.71	1.2	4.3
2455.7	O III	1.9	0.98	0.3	0.8

Emulsion	Gel content ratio	Exp. ratio at 553A	Exp. ratio at 1242A.	Exp. ratio at 1885A
A	1	1.00	1.00	1.00
B	2	4.25	2.27	1.84
C	4	22.5	5.23	2.75

		Average gradient S.W.R.		Relative speed (R.S.) S.W.R.
		103–O U.V.-Sens.		103–O U.V.-Sens.
Wave-length	Elements	${\bar{G}}_{0.3}^{1.0}$	${\bar{G}}_{0.3}^{1.0}$	R.S._D_=0.3	R.S._D_=1.0
553.3	O IV	1.8	0.80	3.9	12.7
629.7	O V	1.8	0.95	4.3	8.2
758.6	O V	1.8	0.95	4.5	11.0
833.7	O III	1.8	0.91	3.1	7.8
921.9	N IV	2.0	0.95	3.2	7.7
1242.7	N V	2.1	0.99	1.9	4.2
1343.5	O IV	2.2	0.94	1.2	4.9
1730.0	N III	2.4	0.90	0.8	3.1
1885.2	N III	2.3	0.90	0.6	1.1
103–O U.V.-Sensitized Film
1885.2	N III	2.0	0.71	1.4	4.5
1920.8	N III	2.1	0.71	1.3	7.2
2128.1	Si IV	2.3	0.80	1.5	5.5
2297.8	C III	1.8	0.70	1.0	4.9
2391.1	O III	1.6	0.71	1.2	4.3
2455.7	O III	1.9	0.98	0.3	0.8

Emulsion	Gel content ratio	Exp. ratio at 553A	Exp. ratio at 1242A.	Exp. ratio at 1885A
A	1	1.00	1.00	1.00
B	2	4.25	2.27	1.84
C	4	22.5	5.23	2.75

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Journal of the Optical Society of America