OSA's Digital Library

Journal of the Optical Society of America

Journal of the Optical Society of America

  • Vol. 51, Iss. 12 — Dec. 1, 1961
  • pp: 1351–1356

Further Studies of Pressure-Modulated Infrared Absorption

RICHARD R. PATTY and DUDLEY WILLIAMS  »View Author Affiliations

JOSA, Vol. 51, Issue 12, pp. 1351-1356 (1961)

View Full Text Article

Acrobat PDF (650 KB)

Browse Journals / Lookup Meetings

Browse by Journal and Year


Lookup Conference Papers

Close Browse Journals / Lookup Meetings

Article Tools



A "pressure modulator" has been constructed for use in studies of modulated infrared emission and absorption spectra. The modulator provides sinusoidal variation of the volume of a gas sample at a frequency of 8 cps with compression ratios of 2:1, 3:1, 4:1, 5:1, and 6:1. The general results obtained in grating studies of the fundamental and first-overtone absorption bands of carbon monoxide can be satisfactorily interpreted on the basis of an adiabatic modulation cycle, although detailed checks of the expected behavior for transitions between high rotational states were not entirely successful. In the adiabatic modulation of a gas for which γ = 1.66, temperatures as high as 640°K and as low as 225°K are attained in the present modulator with a compression ratio of 5:1 without raising the cell temperature more than 45 K deg above room temperature.

RICHARD R. PATTY and DUDLEY WILLIAMS, "Further Studies of Pressure-Modulated Infrared Absorption," J. Opt. Soc. Am. 51, 1351-1356 (1961)

Sort:  Author  |  Journal  |  Reset


  1. In this expression A (v) represents the fraction of incident radiation of frequency v absorbed by the sample; A (v) will be referred to as the absorption at frequency v.
  2. J. N. Howard, D. E. Burch, and D. Williams, J. Opt. Soc. Am. 46, 186, 237, 242, 334, 452 (1956) (bibliography of early studies).
  3. J. C. Gilfert and D. Williams, J. Opt. Soc. Am. 48, 765 (1958); 49, 212 (1959).
  4. From the Bellofram Corporation, Burlington, Massachusetts.
  5. J. R. Nielsen, V. Thornton, and E. B. Dale, Revs. Modern Phys. 16, 307 (1944).
  6. R. Ladenberg and F. Reiche, Ann. Physik 42, 181 (1913).
  7. W. M. Elsasser, Harvard Meteorological Studies No. 6, Harvard University, Cambridge, Massachusetts (1942).
  8. S. S. Penner and D. Weber, J. Chem. Phys. 19, 807 (1951); 19, 817 (1951).
  9. J. H. Shaw and W. L. France, Sci. Rept. No. 4, Air Force Cambridge Research Center contract, and Ohio State University Research Foundation.
  10. E. B. Singleton, Doctoral dissertation, The Ohio State University, Columbus, Ohio (1958).

Cited By

Alert me when this paper is cited

OSA is able to provide readers links to articles that cite this paper by participating in CrossRef's Cited-By Linking service. CrossRef includes content from more than 3000 publishers and societies. In addition to listing OSA journal articles that cite this paper, citing articles from other participating publishers will also be listed.

« Previous Article  |  Next Article »

OSA is a member of CrossRef.

CrossCheck Deposited