Abstract

A high-resolution spectroscopic study has been made of the emission in the 4.3-µ region of electrically excited CO<sub>2</sub>—N<sub>2</sub> and CO<sub>2</sub>—N<sub>2</sub>—He plasmas. CO<sub>2</sub>-rich plasmas emit an intense spectrum in which <i>P</i>-branch and low-<i>J</i><i>R</i>-branch lines appear in absorption. The <i>R</i>-branch band heads (<i>J</i>≅120) appear as emission features in such spectra and there is a region of mixed absorption and emission. CO<sub>2</sub>—N<sub>2</sub> plasmas which would sustain laser oscillations in a suitable cavity exhibit emission lines and derive most of their intensity from the fundamental and four hot bands of the naturally abundant CO<sub>2</sub> isotope. With the mixture ratio and pressure carefully adjusted, the CO<sub>2</sub>—N<sub>2</sub>—He plasma emits lines of the 00°3-00°2 and 00°2-00°1 bands. Bands from <sup>13</sup>C<sup>16</sup>O<sub>2</sub>, <sup>12</sup>C<sup>16</sup>O<sup>18</sup>O, and <sup>13</sup>C<sup>16</sup>O<sup>18</sup>O, which are prominent in the CO<sub>2</sub> absorption spectra, do not appear in the plasma spectra. The molecular constants ω<sub>3</sub><sup>0</sup>, <i>x</i><sup>0</sup><sub>33</sub>, and <i>y</i><sub>333</sub> are derived from bands in the 00<i>ν</i><sub>3</sub>-00(<i>ν</i><sub>3</sub>-1) sequence.

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  1. F. Legay and P. Barchewitz, Compt. Rend. 256, 5305 (1963).
  2. F. Legay, J. Phys. (France) 25, 999 (1964).
  3. L. O. Hocker, M. A. Kovacs, C. K. Rhodes, G. W. Flynn, and A. Javan, Phys. Rev. Letters 17, 233 (1966).
  4. Sold by the Welch Scientific Co., 1515 Sedgewick St., Chicago, Ill.
  5. T. K. McCubbin, Jr., J. A. Lowenthal, and H. R. Gordon, Appl. Opt. 4, 711 (1965).
  6. K. N. Rao, R. Oberly, Y. H. Hahn, and T. K. McCubbin, Jr., J. Mol. Spectry, Vol. 25 (1968).
  7. C. P. Courtoy, Ann. Soc. Sci. Bruxelles 73, No. I, 5 (1959).
  8. A. Fayt, C. P. Courtoy, M. de Hemptine, Ann. Soc. Sci. Bruxelles 79, No. III, 233–235 (1965).
  9. G. Herzberg and L. Herzberg, J. Opt. Soc. Am. 43, 1037 (1953).

de Hemptine, M.

A. Fayt, C. P. Courtoy, M. de Hemptine, Ann. Soc. Sci. Bruxelles 79, No. III, 233–235 (1965).

Barchewitz, P.

F. Legay and P. Barchewitz, Compt. Rend. 256, 5305 (1963).

Courtoy, C. P.

C. P. Courtoy, Ann. Soc. Sci. Bruxelles 73, No. I, 5 (1959).

A. Fayt, C. P. Courtoy, M. de Hemptine, Ann. Soc. Sci. Bruxelles 79, No. III, 233–235 (1965).

Fayt, A.

A. Fayt, C. P. Courtoy, M. de Hemptine, Ann. Soc. Sci. Bruxelles 79, No. III, 233–235 (1965).

Flynn, G. W.

L. O. Hocker, M. A. Kovacs, C. K. Rhodes, G. W. Flynn, and A. Javan, Phys. Rev. Letters 17, 233 (1966).

Gordon, H. R.

T. K. McCubbin, Jr., J. A. Lowenthal, and H. R. Gordon, Appl. Opt. 4, 711 (1965).

Hahn, Y. H.

K. N. Rao, R. Oberly, Y. H. Hahn, and T. K. McCubbin, Jr., J. Mol. Spectry, Vol. 25 (1968).

Herzberg, G.

G. Herzberg and L. Herzberg, J. Opt. Soc. Am. 43, 1037 (1953).

Herzberg, L.

G. Herzberg and L. Herzberg, J. Opt. Soc. Am. 43, 1037 (1953).

Hocker, L. O.

L. O. Hocker, M. A. Kovacs, C. K. Rhodes, G. W. Flynn, and A. Javan, Phys. Rev. Letters 17, 233 (1966).

Javan, A.

L. O. Hocker, M. A. Kovacs, C. K. Rhodes, G. W. Flynn, and A. Javan, Phys. Rev. Letters 17, 233 (1966).

Kovacs, M. A.

L. O. Hocker, M. A. Kovacs, C. K. Rhodes, G. W. Flynn, and A. Javan, Phys. Rev. Letters 17, 233 (1966).

Legay, F.

F. Legay, J. Phys. (France) 25, 999 (1964).

F. Legay and P. Barchewitz, Compt. Rend. 256, 5305 (1963).

Lowenthal, J. A.

T. K. McCubbin, Jr., J. A. Lowenthal, and H. R. Gordon, Appl. Opt. 4, 711 (1965).

McCubbin, Jr., T. K.

T. K. McCubbin, Jr., J. A. Lowenthal, and H. R. Gordon, Appl. Opt. 4, 711 (1965).

K. N. Rao, R. Oberly, Y. H. Hahn, and T. K. McCubbin, Jr., J. Mol. Spectry, Vol. 25 (1968).

Oberly, R.

K. N. Rao, R. Oberly, Y. H. Hahn, and T. K. McCubbin, Jr., J. Mol. Spectry, Vol. 25 (1968).

Rao, K. N.

K. N. Rao, R. Oberly, Y. H. Hahn, and T. K. McCubbin, Jr., J. Mol. Spectry, Vol. 25 (1968).

Rhodes, C. K.

L. O. Hocker, M. A. Kovacs, C. K. Rhodes, G. W. Flynn, and A. Javan, Phys. Rev. Letters 17, 233 (1966).

Other (9)

F. Legay and P. Barchewitz, Compt. Rend. 256, 5305 (1963).

F. Legay, J. Phys. (France) 25, 999 (1964).

L. O. Hocker, M. A. Kovacs, C. K. Rhodes, G. W. Flynn, and A. Javan, Phys. Rev. Letters 17, 233 (1966).

Sold by the Welch Scientific Co., 1515 Sedgewick St., Chicago, Ill.

T. K. McCubbin, Jr., J. A. Lowenthal, and H. R. Gordon, Appl. Opt. 4, 711 (1965).

K. N. Rao, R. Oberly, Y. H. Hahn, and T. K. McCubbin, Jr., J. Mol. Spectry, Vol. 25 (1968).

C. P. Courtoy, Ann. Soc. Sci. Bruxelles 73, No. I, 5 (1959).

A. Fayt, C. P. Courtoy, M. de Hemptine, Ann. Soc. Sci. Bruxelles 79, No. III, 233–235 (1965).

G. Herzberg and L. Herzberg, J. Opt. Soc. Am. 43, 1037 (1953).

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