Abstract

High-resolution infrared spectroscopy with a small grating instrument has now been extended to wavelengths of nearly 200 microns. In the range 5-50 microns the achieved resolution was about 0.3 cm<sup>-1</sup> or slightly better. Beyond 50 microns the resolution varied from 0.5 to 1.0 cm<sup>-1</sup>. No predispersive device was used, but filters, residual-ray reflections, selective chopping of radiation, and "off-blaze" use of the doubly passed gratings were employed to remove higher orders from the spectra. These devices are discussed briefly and their characteristics for the various spectral regions have been tabulated. Calibration has been carried out with higher orders of atomic emission lines and absorption lines of previously measured molecular spectra. Wave-number precision is estimated as about 0.04-0.05 cm<sup>-1</sup> in most spectral regions. Performance of the spectrometers is illustrated by reproductions of the actual recorded spectra of water vapor at 1600, 300, and 200-55 cm<sup>-1</sup>, of ethylene and ammonia at 950 cm<sup>-1</sup>, of benzene at 673 cm<sup>-1</sup>, and of carbon disulfide at 400 cm<sup>-1</sup>.

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  1. R. C. Lord and T. K. McCubbin, Jr., J. Opt. Soc. Am. 45, 441 (1955).
  2. Barnes, McDonald, Williams, and Kinnard, J. Appl. Phys. 16, 77 (1945).
  3. M. Czerny, Z. Physik 16, 321 (1923).
  4. J. Strong, J. Opt. Soc. Am. 29, 520 (1939).
  5. See Oetjen, Haynie, Ward, Hansler, Schauwecker, and Bell, J. Opt. Soc. Am. 42, 559 (1952).
  6. H. Rubens, Verh. Deut. Ges. 15, 109 (1896).
  7. M. Czerny, Z. Physik 16, 321 (1923).
  8. F. A. Firestone, Rev. Sci. Instr. 3, 186 (1932).
  9. H. M. Randall, Revs. Modern Phys. 10, 78 (1938).
  10. Handbook of Chemistry and Physics (Chemical Rubber Publishing Company, Cleveland, Ohio, 1953), various recent editions, e.g., 35th edition, pp. 2477–2637.
  11. Unpublished private communication from Dr. E. K. Plyler.
  12. E. K. Plyler, J. Opt. Soc. Am. 45, 102 (1955).
  13. Benedict, Claassen, and Shaw, J. Research Natl. Bur. Standards 44, 91 (1952).
  14. W. S. Benedict and E. K. Plyler, J. Research Natl. Bur. Standards 46, 246 (1951).
  15. Randall, Dennison, Ginsburg, and Barker, Phys. Rev. 45, 160 (1937).
  16. B. Stoicheff, Can. J. Phys. 32, 339 (1954).

Benedict, W. S.

W. S. Benedict and E. K. Plyler, J. Research Natl. Bur. Standards 46, 246 (1951).

Czerny, M.

M. Czerny, Z. Physik 16, 321 (1923).

M. Czerny, Z. Physik 16, 321 (1923).

Firestone, F. A.

F. A. Firestone, Rev. Sci. Instr. 3, 186 (1932).

Lord, R. C.

R. C. Lord and T. K. McCubbin, Jr., J. Opt. Soc. Am. 45, 441 (1955).

McCubbin, Jr., T. K.

R. C. Lord and T. K. McCubbin, Jr., J. Opt. Soc. Am. 45, 441 (1955).

Plyler, E. K.

Unpublished private communication from Dr. E. K. Plyler.

E. K. Plyler, J. Opt. Soc. Am. 45, 102 (1955).

W. S. Benedict and E. K. Plyler, J. Research Natl. Bur. Standards 46, 246 (1951).

Randall, H. M.

H. M. Randall, Revs. Modern Phys. 10, 78 (1938).

Rubens, H.

H. Rubens, Verh. Deut. Ges. 15, 109 (1896).

Stoicheff, B.

B. Stoicheff, Can. J. Phys. 32, 339 (1954).

Strong, J.

J. Strong, J. Opt. Soc. Am. 29, 520 (1939).

Other

R. C. Lord and T. K. McCubbin, Jr., J. Opt. Soc. Am. 45, 441 (1955).

Barnes, McDonald, Williams, and Kinnard, J. Appl. Phys. 16, 77 (1945).

M. Czerny, Z. Physik 16, 321 (1923).

J. Strong, J. Opt. Soc. Am. 29, 520 (1939).

See Oetjen, Haynie, Ward, Hansler, Schauwecker, and Bell, J. Opt. Soc. Am. 42, 559 (1952).

H. Rubens, Verh. Deut. Ges. 15, 109 (1896).

M. Czerny, Z. Physik 16, 321 (1923).

F. A. Firestone, Rev. Sci. Instr. 3, 186 (1932).

H. M. Randall, Revs. Modern Phys. 10, 78 (1938).

Handbook of Chemistry and Physics (Chemical Rubber Publishing Company, Cleveland, Ohio, 1953), various recent editions, e.g., 35th edition, pp. 2477–2637.

Unpublished private communication from Dr. E. K. Plyler.

E. K. Plyler, J. Opt. Soc. Am. 45, 102 (1955).

Benedict, Claassen, and Shaw, J. Research Natl. Bur. Standards 44, 91 (1952).

W. S. Benedict and E. K. Plyler, J. Research Natl. Bur. Standards 46, 246 (1951).

Randall, Dennison, Ginsburg, and Barker, Phys. Rev. 45, 160 (1937).

B. Stoicheff, Can. J. Phys. 32, 339 (1954).

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