Abstract

A high-resolution spectroscopic study has been made of the emission in the 4.3-μ region of electrically excited CO₂–N₂ and CO₂–N₂–He plasmas. CO₂-rich plasmas emit an intense spectrum in which P-branch and low-J R-branch lines appear in absorption. The R-branch band heads (J ≅ 120) appear as emission features in such spectra and there is a region of mixed absorption and emission. CO₂–N₂ 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 CO₂ isotope. With the mixture ratio and pressure carefully adjusted, the CO₂–N₂–He plasma emits lines of the 00⁰3–00⁰2 and 00⁰2–00⁰1 bands. Bands from ¹³C¹⁶O₂, ¹²C¹⁶O¹⁸O, and ¹³C¹⁶O¹⁸O, which are prominent in the CO₂ absorption spectra, do not appear in the plasma spectra. The molecular constants ω₃⁰, x⁰₃₃, and y₃₃₃ are derived from bands in the 00υ₃–00(υ₃ − 1) sequence.

© 1967 Optical Society of America

Quenching of Infrared Chemiluminescence. 1: The Rates of De-Excitation of CO (4 ≤ v ≤ 13) by He, CO, NO, N₂, O₂, OCS, N₂O, and CO₂

G. Hancock and I. W. M. Smith
Appl. Opt. 10(8) 1827-1842 (1971)

Highly Precise Wavelengths in the Infrared. II. HCN, N₂O, and CO†

D. H. Rank, D. P. Eastman, B. S. Rao, and T. A. Wiggins
J. Opt. Soc. Am. 51(9) 929-936 (1961)

Absorption of Infrared Radiation by CO₂ and H₂O. Experimental Techniques*

Darrell E. Burch, David A. Gryvnak, and Richard R. Patty
J. Opt. Soc. Am. 57(7) 885-895 (1967)

Mass-Spectrometric Study of Photoionization. VI. O₂, CO₂, COS, and CS₂†

Vernon H. Dibeler and James A. Walker
J. Opt. Soc. Am. 57(8) 1007-1012 (1967)

Analysis of the He ii 4686-Å (n = 4 to n = 3) Line Complex Excited in an Atomic-Beam Light Source*

Harold P. Larson and Robert W. Stanley
J. Opt. Soc. Am. 57(12) 1439-1448 (1967)