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Journal of the Optical Society of America

Journal of the Optical Society of America

  • Vol. 54, Iss. 3 — Mar. 1, 1964
  • pp: 326–330

Infrared Fluorescence of Carbon Monoxide

DAVID J. McCAA and DUDLEY WILLIAMS  »View Author Affiliations

JOSA, Vol. 54, Issue 3, pp. 326-330 (1964)

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Radiation chopping techniques have been employed to study infrared fluorescence of pure carbon monoxide in the region of its fundamental. The present study has served to confirm earlier results obtained by R. C. Millikan using quite different techniques. In addition, CO fluorescence emission V = 1 → 0 was observed from samples irradiated in such a manner as to produce only V =0 → 2 initial absorption. The results can be interpreted in terms of resonant collisions, with the selection rule ΔV= ±1, as follows: CO(V=2)+CO(V=0) → CO(V= 1)+CO(V= 1), with fluorescence emission from the molecules in the V = 1 state.

DAVID J. McCAA and DUDLEY WILLIAMS, "Infrared Fluorescence of Carbon Monoxide," J. Opt. Soc. Am. 54, 326-330 (1964)

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  1. W. J. Hooker and R. C. Millikan, J. Chem. Phys. 38, 214 (1963).
  2. R. C. Millikan, Phys. Rev. Letters 8, 253 (1962); ibid. 38, 2855 (1963).
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  9. F. LeGay and M. LeGay, paper presented at Astrophysical Colloquium, Liège, 1963.
  10. Although the blackbody curves furnish a convenient set of references, they do not give measures of the temperatures of the emitting gases. The CO samples in the cell were optically thin, and their emission spectra consisted of individual lines as contrasted with the continuous spectrum of a blackbody. The actual temperatures of the gas samples are considerably higher than those of blackbodies giving equal chart deflections.
  11. Under conditions of intense irradiation, higher vibrational states could become populated by absorption. However, successive resonant collisions with molecules in the ground state would eventually populate the V = 1 state from which fluorescence would occur.
  12. D. E. Burch and D. Williams, Appl. Opt. 1, 587 (1962).
  13. S. S. Penner and D. Weber, J. Chem. Phys. 19, 807 (1951).

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