Letter | Published:

Structure of a New System of CO Bands

Nature volume 140, page 508 (18 September 1937) | Download Citation



IN a previous note1 the discovery of a new system of red-degraded CO bands, placed just before the heads of the violet-degraded Third Positive system, was reported. Inspection and measurement of high-dispersion spectrograms now show that the new bands have a structure appropriate to a 3Σ?3II band-system, the lower state being the a3II state, which is the usual final state of the CO triplet systems. The upper 3Σ levels of the new bands lie about 83705 cm.1 and 85885 cm.1 above the CO ground state ; they have observable spin-splittings and rotational constants B = 0·7 to 0·8 cm.1. The system may tentatively be designated as f3Σ?a3II. It may be considered, however, as probably due to transitions from the higher vibrational levels of a3Σ to the lower vibrational levels of a3II. For, within the heights of the initial levels f3∑ of the new bands occur also the initial levels b3Σ of the Third Positive bands, and the latter are strongly perturbed, as has already been established2, by vibrational levels of the a3Σ state, for which we have predicted term values and rotational constants of the magnitude now observed for the new bands.Rotational analysis and details will be published shortly elsewhere.

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  1. 1.

    , and , Naturwiss., 25, 90 (1937).

  2. 2.

    , and , Z. Phys., 105, 36 (1937) 106, 205 (1937).

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  1. Physical Institute, Royal Hungarian University, Budapest. July 31.

    • R. SCHMID
    •  & L. GERÖ


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