Abstract

By using separated isotopes of mercury 198 and mercury 202, in sealed discharge tubes, the isotope shift in several lines from 16 000 A to 4000 A has been measured with direct recording techniques. A grating in crossed with a pressure tuned Fabry-Perot interferometer was coupled to electronic detectors to make a linear recording system. The detectors were a photomultiplier tube in the visible and a lead sulfide cell in the infrared. The output of the detector is amplified and then recorded on a strip chart recorder. By optical switching between the two discharge tubes during the recording both isotopes appear on the same record without overlapping of the intensity pattern. Because of the inherently high accuracy of this type of system the probable errors are small.

© 1957 Optical Society of America

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References

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  1. W. F. Meggers, J. Opt. Soc. Am. 38, 7 (1948).
    [Crossref] [PubMed]
  2. Breit, Arfken, and Clendenin, Phys. Rev. 78, 390 (1950).
    [Crossref]
  3. C. Dufour and P. Jacquinot, J. recherches centre natl. recherche sci. Labs. Bellevue (Paris) 6, 91 (1948).

1950 (1)

Breit, Arfken, and Clendenin, Phys. Rev. 78, 390 (1950).
[Crossref]

1948 (2)

C. Dufour and P. Jacquinot, J. recherches centre natl. recherche sci. Labs. Bellevue (Paris) 6, 91 (1948).

W. F. Meggers, J. Opt. Soc. Am. 38, 7 (1948).
[Crossref] [PubMed]

Arfken,

Breit, Arfken, and Clendenin, Phys. Rev. 78, 390 (1950).
[Crossref]

Breit,

Breit, Arfken, and Clendenin, Phys. Rev. 78, 390 (1950).
[Crossref]

Clendenin,

Breit, Arfken, and Clendenin, Phys. Rev. 78, 390 (1950).
[Crossref]

Dufour, C.

C. Dufour and P. Jacquinot, J. recherches centre natl. recherche sci. Labs. Bellevue (Paris) 6, 91 (1948).

Jacquinot, P.

C. Dufour and P. Jacquinot, J. recherches centre natl. recherche sci. Labs. Bellevue (Paris) 6, 91 (1948).

Meggers, W. F.

J. Opt. Soc. Am. (1)

J. recherches centre natl. recherche sci. Labs. Bellevue (Paris) (1)

C. Dufour and P. Jacquinot, J. recherches centre natl. recherche sci. Labs. Bellevue (Paris) 6, 91 (1948).

Phys. Rev. (1)

Breit, Arfken, and Clendenin, Phys. Rev. 78, 390 (1950).
[Crossref]

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Figures (2)

Fig. 1
Fig. 1

Optical system: Concave mirror, M1, images the light sources on the slit of the monchromator; the grating, G, is placed with the slit at the focus of the grating mirror to obtain parallel light for the interferometer.

Fig. 2
Fig. 2

Isotope shift for λ 15 295 A showing the break between the maxima when the light sources are switched. The order numbers shown were determined with a smaller spacer than the spacer used here, which was 4.5979 cm.

Tables (1)

Tables Icon

Table I Isotope shifts in the spectrum of Hg202–Hg198.