Abstract

The performance of a paraterphenyl-coated 1P21 multiplier has been studied in the extreme ultraviolet from 125 to 325 Å. The light source was a vacuum spark between aluminum electrodes with a peak current of 30 kA. A number of lines from the fourth, fifth, and sixth spectra of aluminum were observed and the results were compared with those of earlier work in this laboratory in which Kodak SWR photographic plates, a Bendix resistance-strip photomultiplier, and a sodium salicylate-coated photomultiplier were compared. The paraterphenyl, which was vacuum evaporated on a cover glass to a thickness of 2.74 mg/cm2, was found to be stable over a period of at least 10 days in the vacuum spectrograph. Its relative efficiency in the range from 312 to 200 Å is more nearly constant than that of the other three detectors. Below 161 Å the response of all the detectors decreases. Paraterphenyl appears to be a sensitive and highly satisfactory detector in the region below 325 Å.

© 1971 Optical Society of America

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References

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  1. R. W. Kebler, W. W. McCormick, and R. A. Sawyer, J. Opt. Soc. Am. 44, 270 (1954).
    [Crossref]
  2. D. A. Warner, G. T. Oser, W. W. McCormick, and R. A. Sawyer, J. Opt. Soc. Am. 57, 1362 (1967).
    [Crossref]
  3. H. W. Jones, W. W. McCormick, and R. A. Sawyer, J. Opt. Soc. Am. 51, 833 (1961).
    [Crossref]
  4. P. G. Kruger, Rev. Sci. Instr. 4, 128 (1933).
    [Crossref]
  5. J. A. R. Samson, Techniques of Vacuum Ultraviolet Spectroscopy (Wiley, New York, 1967).

1967 (1)

1961 (1)

1954 (1)

1933 (1)

P. G. Kruger, Rev. Sci. Instr. 4, 128 (1933).
[Crossref]

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Figures (6)

Fig. 1
Fig. 1

Intensity ratios of two pairs of spectral lines, only 3 Å apart, measured with: A, Kodak SWR plates; B, a Bendix resistance-strip magnetic photomultiplier; C, a sodium salicylate-coated photomultiplier; D, a paraterphenyl-coated photomultiplier.

Fig. 2
Fig. 2

Intensity ratios of two pairs of lines, about 30 Å apart, measured with: A, SWR plates; B, the Bendix detector; C, the sodium salicylate detector; D, the paraterphenyl detector.

Fig. 3
Fig. 3

Intensity ratios of two pairs of lines, about 79 Å apart, measured with: A, SWR plates; B, the Bendix detector; C, the sodium salicylate detector; D, the paraterphenyl detector.

Fig. 4
Fig. 4

Intensity ratios of three pairs of lines, from 120 to 150 Å apart, measured with: A, SWR plates; B, the Bendix detector; C, the sodium salicylate detector; D, the paraterphenyl detector.

Fig. 5
Fig. 5

Relative efficiency vs wavelength: Solid curve (after Samson) for sodium salicylate; points and dotted line for paraterphenyl. Small circles at lower left indicate suggested values for sodium salicylate, calculated from p-terphenyl data.

Fig. 6
Fig. 6

Relative efficiency vs wavelength for the Bendix detector (dots) and SWR plates (circles) assuming a value of unity at 309 Å (dot inside circle).

Tables (1)

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Table I Numerical values of Rn.

Equations (7)

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V = K I E ,
E 1 / E n = V 1 / V n × I n / I 1 .
E 309 / E n = ( V 309 / V n ) ( I n / I 309 ) .
E 309 / E n = ( V 309 / V n ) ( I n / I 309 ) .
E n E n = [ V 309 / V n V 309 / V n ] E 309 E 309 .
E n E n = 4.50 [ V 309 / V n V 309 / V n ] = R n .
K E n = R n E n ,