EFFECT OF FERMI RESONANCE ON THE CENTRIFUGAL DISTORTION CONSTANTS D OF $CO_{2}$.

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1954

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Ohio State University

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The bands of the triad 2ν1+ν3,ν1+2ν2+ν3,4ν2+ν3 and of the tetrad 3ν1+ν3,2ν1+2ν2+ν3,ν1+4ν2+ν3,6ν2+ν3 have been reinvestigated with a long absorbing path and high resolution. A greater number of lines than previously observed have been measured making it possible to obtain better rotational constants B and D. The centrifugal distortion constants D obtained for the upper states of the bands differ from that of the ground state by amounts up to 50%. This effect appears to be symmetric within the triad and within the tetrad, and the mean value of the constants D for each of these groups of levels is nearly the same as the value in the ground state. A similar effect has also been observed in some of the corresponding ""hot"" bands, e.g., 5ν2+ν3ν2.

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Author Institution: Division of Physics, National Research Council of Canada

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