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Journal of the Optical Society of America

Journal of the Optical Society of America

  • Vol. 49, Iss. 6 — Jun. 1, 1959
  • pp: 603–606

Infrared Vacuum Spectrometer with Prism/Grating Double Monochromator

C. S. C. TARBET and E. F. DALY  »View Author Affiliations

JOSA, Vol. 49, Issue 6, pp. 603-606 (1959)

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A prism/grating double monochromator has been made in which the grating monochromator has been ganged with a rocksalt monochromator on a linear frequency basis. Two replica gratings, each used in a single order, cover the range 650 cm-1 to 3650 cm-1. Resolution is such that peaks with a separation of 0.3 cm-1 at 950 cm-1 may be resolved. Gratings and cams and also prisms may be interchanged by operation of press buttons. Similarly the instrument may be converted to a single prism monochromator to extend the frequency range. A constant energy background is provided by magnetically operated slits programed by a tapped potentiometer. The double beam photometer uses a starwheel beam attenuator and is capable of good quantitative accuracy. The whole optical system is evacuable and a pressure of 10-3 mm Hg within the vacuum casing is satisfactory for accurate work at grating resolution.

C. S. C. TARBET and E. F. DALY, "Infrared Vacuum Spectrometer with Prism/Grating Double Monochromator," J. Opt. Soc. Am. 49, 603-606 (1959)

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