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Bulletin of the Lebedev Physics Institute

, Volume 35, Issue 4, pp 101–103 | Cite as

Prohibition of ortho-para transitions in a water molecule

  • V. K. Konyukhov
Article

Abstract

A theoretical consideration is given to three types of prohibition of transitions between the rotational states of spin isomers of an H 2 16 O molecule, which are based on the molecular symmetry. This is the symmetry of the electron shell of the molecule, of the proton spin functions, of the spatial position of molecular nuclei, and of the rotational Hamiltonian. The prohibition of dipole transitions between isomers and the prohibition of transitions on the basis of the Pauli principle were known earlier. Another prohibition exists which is a consequence of the symmetric position of protons relative to the oxygen nucleus. Conditions are indicated under which the prohibition of ortho-para transitions in a water molecule disappear. In the general form these conditions are realized when the molecule loses the above-listed symmetries. Transitions are allowed in the dipole approximation if the proton spin moments are free and do not form superposition states and the O-H bond lengths are different because of nonlinearity of the molecular vibrations. The transitions are induced by the dipole-moment component due to the deformation of the electron shell of the molecule.

Keywords

Dipole Transition Electron Shell Rotational State Molecular Symmetry Spin Function 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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References

  1. 1.
    V. K. Konyukhov, V. I. Tikhonov, T. L. Tikhonova, and V. N. Faizulaev, Pis’ma Zh. Tekh. Fiz. 12, 1438 (1986).Google Scholar
  2. 2.
    V. K. Konyukhov, V. I. Tikhonov, and T. L. Tikhonova, Kratkie Soobshcheniya po Fizike FIAN, No. 9, 12 (1988) [Soviet Physics — Lebedev Institute Reports, No. 9, 9 (1988)].Google Scholar
  3. 3.
    V. K. Konyukhov, V. P. Logvinenko, and V. I. Tikhonov, Kratkie Soobshcheniya po Fizike FIAN, No. 5–6, 83 (1995) [Bulletin of the Lebedev Physics Institute, No. 6, 31 (1995)].Google Scholar
  4. 4.
    V. I. Tikhonov and A. A. Volkov, Science 296, 2363 (2002).CrossRefGoogle Scholar
  5. 5.
    V. I. Tikhonov, A. M. Makurenkov, V. G. Artemov, et al., Physics of Wave Phenomena 15(2), 106 (2007).CrossRefGoogle Scholar
  6. 6.
    L. D. Landau and E. M. Lifshitz, Quantum Mechanics (Nauka, Moscow, 2002; Pergamon Press, Oxford, 1977).Google Scholar
  7. 7.
    R. McWeeny, Methodes of Molecular Quantum Mechanics, 2nd ed. (Academic Press, London, San Diego, California, 2001).Google Scholar
  8. 8.
    S. E. Chio, J. C. Light, J. Chem. Phys. 97, 7031 (1992).CrossRefADSGoogle Scholar
  9. 9.
    D. Giulini, “Decoherence: A Dynamical Approach to Superselection Rule?” in: Relativistic Quantum Measurement and Decoherence, Ed. by H.-P. Breuer and F. Petruccione (Springer, Berlin, 2000).Google Scholar
  10. 10.
    A. Miani and J. Tennyson, J. Chem. Phys. 120, 2732 (2004).CrossRefADSGoogle Scholar
  11. 11.
    V. K. Konyukhov, Kratkie Soobshcheniya po Fizike FIAN, No. 9–10, 14 (1997) [Bulletin of the Lebedev Physics Institute, No. 9, 10 (1997)].Google Scholar
  12. 12.
    R. F. Curle, Jr. Jerome, V. V. Kasper, and K. S. Pitzer, J. Chem. Phys. 46, 3220 (1967).CrossRefADSGoogle Scholar

Copyright information

© Allerton Press, Inc. 2008

Authors and Affiliations

  • V. K. Konyukhov
    • 1
  1. 1.Prokhorov General Physics InstituteRussian Academy of SciencesMoscowRussia

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