Letter | Published:

Rotational Analysis of Absorption Bands of Lead Monoxide

Naturevolume 191pages374375 (1961) | Download Citation



THE low-lying states of N2 and of CO arise from electron configurations1 which may be written: In the group of molecules from CO to PbTe, the allowed absorption bands of longest wave-length may then be expected to be 1Σ+, 1π – X 1Σ+. This is found to be the case, for example, in SiS, where the systems D 1Π – X 1Σ+ and E 1Σ+X 1Σ+ appear readily in absorption2,3. In addition, evidence about some other predicted states, notably e 3Σ, I 1Σ and (?)1Δ, has been obtained from work4,5 on the perturbations in D 1Π. In SiO, GeO and SnO there is no further strong absorption6 until wave-lengths considerably shorter than those corresponding to the EX systems, indicating that more highly excited orbitals than (2) or (3) are here involved.

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  1. 1

    Mulliken, R. S., The Threshold of Space, edit. by Zelikoff (London, 1957).

  2. 2

    Vago, E. E., and Barrow, R. F., Proc. Phys. Soc., 68, 538 (1946).

  3. 3

    Barrow, R. F., Deutsch, J. L., Lagerqvist, A., and Westerlund, B. (in the press).

  4. 4

    Lagerqvist, A., Nilheden, G., and Barrow, R. F., Proc. Phys. Soc., A, 65, 419 (1952).

  5. 5

    Nilheden, G., Ark. Fys., 10, 19 (1955).

  6. 6

    Barrow, R. F., and Rowlinson, H. C., Proc. Roy. Soc., A, 224, 374 (1954).

  7. 7

    Herzberg, G., Molecular Spectra and Molecular Structure. 1. Spectra of Diatomic Molecules (New York, 1950).

  8. 8

    Christy, A., and Bloomenthal, S., Phys. Rev., 35, 46 (1930).

  9. 9

    Howell, H. G., Proc. Roy. Soc., A, 153, 683 (1936).

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  1. Physical Chemistry Laboratory, University of Oxford

    • R. F. BARROW
    • , J. L. DEUTSCH
    •  & D. N. TRAVIS


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