Abstract

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.

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  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).

Burch, D. E.

J. N. Howard, D. E. Burch, and D. Williams, J. Opt. Soc. Am. 46, 186, 237, 242, 334, 452 (1956) (bibliography of early studies).

Dale, E. B.

J. R. Nielsen, V. Thornton, and E. B. Dale, Revs. Modern Phys. 16, 307 (1944).

Elsasser, W. M.

W. M. Elsasser, Harvard Meteorological Studies No. 6, Harvard University, Cambridge, Massachusetts (1942).

France, W. L.

J. H. Shaw and W. L. France, Sci. Rept. No. 4, Air Force Cambridge Research Center contract, and Ohio State University Research Foundation.

Gilfert, J. C.

J. C. Gilfert and D. Williams, J. Opt. Soc. Am. 48, 765 (1958); 49, 212 (1959).

Howard, J. N.

J. N. Howard, D. E. Burch, and D. Williams, J. Opt. Soc. Am. 46, 186, 237, 242, 334, 452 (1956) (bibliography of early studies).

Ladenberg, R.

R. Ladenberg and F. Reiche, Ann. Physik 42, 181 (1913).

Nielsen, J. R.

J. R. Nielsen, V. Thornton, and E. B. Dale, Revs. Modern Phys. 16, 307 (1944).

Penner, S. S.

S. S. Penner and D. Weber, J. Chem. Phys. 19, 807 (1951); 19, 817 (1951).

Reiche, F.

R. Ladenberg and F. Reiche, Ann. Physik 42, 181 (1913).

Shaw, J. H.

J. H. Shaw and W. L. France, Sci. Rept. No. 4, Air Force Cambridge Research Center contract, and Ohio State University Research Foundation.

Singleton, E. B.

E. B. Singleton, Doctoral dissertation, The Ohio State University, Columbus, Ohio (1958).

Thornton, V.

J. R. Nielsen, V. Thornton, and E. B. Dale, Revs. Modern Phys. 16, 307 (1944).

Weber, D.

S. S. Penner and D. Weber, J. Chem. Phys. 19, 807 (1951); 19, 817 (1951).

Williams, D.

J. C. Gilfert and D. Williams, J. Opt. Soc. Am. 48, 765 (1958); 49, 212 (1959).

J. N. Howard, D. E. Burch, and D. Williams, J. Opt. Soc. Am. 46, 186, 237, 242, 334, 452 (1956) (bibliography of early studies).

Other (10)

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.

J. N. Howard, D. E. Burch, and D. Williams, J. Opt. Soc. Am. 46, 186, 237, 242, 334, 452 (1956) (bibliography of early studies).

J. C. Gilfert and D. Williams, J. Opt. Soc. Am. 48, 765 (1958); 49, 212 (1959).

From the Bellofram Corporation, Burlington, Massachusetts.

J. R. Nielsen, V. Thornton, and E. B. Dale, Revs. Modern Phys. 16, 307 (1944).

R. Ladenberg and F. Reiche, Ann. Physik 42, 181 (1913).

W. M. Elsasser, Harvard Meteorological Studies No. 6, Harvard University, Cambridge, Massachusetts (1942).

S. S. Penner and D. Weber, J. Chem. Phys. 19, 807 (1951); 19, 817 (1951).

J. H. Shaw and W. L. France, Sci. Rept. No. 4, Air Force Cambridge Research Center contract, and Ohio State University Research Foundation.

E. B. Singleton, Doctoral dissertation, The Ohio State University, Columbus, Ohio (1958).

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