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The effect of electron-spin uncoupling on differential scattering cross sections for excited alkalirare gas systems

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Zeitschrift für Physik A Atoms and Nuclei

Abstract

We have measured differential cross sections for the scattering of laser-excited Na(32 P 3/2) by Ne. The rapid oscillations in the experimental scattering patterns measured at high angular resolution cannot be explained semi-classically on the basis of the elastic approximation. We therefore apply a collision model proposed by MasnouSeeuws et al. [1] which takes into account the partial uncoupling of the electron-spin from the orbital angular momentum.

The results obtained with this model are — for the first time — compared quantitatively with the result of a fully quantummechanical close-coupling calculation and with our experimental data. In both cases good agreement is found. This proves that the observed oscillatory structure is strongly influenced byΠ-∑ interferences which — due to spin uncoupling — do not cancel even if the scattering signals are summed over all final fine-structure states.

Our semi-classical analysis is also applied to the Na(32 P 1/2)-Ar and K(42 P 3/2)-Ar scattering experiments reported by Düren et al. [2, 3]. The agreement with regard to the frequency of the oscillatory structure indicates that here too spin uncoupling causes theΠ-∑ interferences to appear in the differential cross sections.

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References

  1. Masnou-Seeuws, F., Philippe, M., Roueff, E., Spielfiedel, A.: J. Phys. B12, 4065 (1979)

    Google Scholar 

  2. Düren, R., Liedtke, R.: J. Chem. Phys.74, 6995 (1981)

    Google Scholar 

  3. Düren, R., Hasselbrink, E., Tischer, H.: Phys. Rev. Lett.50, 1983 (1983)

    Google Scholar 

  4. Düren, R.: Adv. Mol. Phys.16, 55 (1980)

    Google Scholar 

  5. Bottcher, C.: J. Phys. B9, 3099 (1976)

    Google Scholar 

  6. Carter, G., Pritchard, D., Kaplan, M., Ducas, T.: Phys. Rev. Lett.35, 1144 (1975)

    Google Scholar 

  7. Ahmad-Bitar, R., Lapatovich, W.P., Pritchard, D.E., Renhorn, I.: Phys. Rev. Lett.39, 1657 (1977)

    Google Scholar 

  8. Mies, F.H.: Phys. Rev. A7, 942 (1973)

    Google Scholar 

  9. Gaussorgues, C., Masnou-Seeuws, F.: J. Phys. B10, 2125 (1977)

    Google Scholar 

  10. Reid, R.H.G.: J. Phys. B8, L493 (1975)

    Google Scholar 

  11. Düren, R.: Comm. At. Mol. Phys.14, 127 (1984)

    Google Scholar 

  12. Deventer, J.J.M. Van, Valk, F. Van der.: Physica112C, 119 (1982)

    Google Scholar 

  13. Berg, F. Van den, Morgenstern, R., Valk, F. Van der, Alkemade, C. Th. J.: Z. Phys. A — Atoms and Nuclei312, 271 (1983)

    Google Scholar 

  14. Wofsy, S., Reid, R.H.G., Dalgarno, A.: Astrophys. J.168, 161 (1971)

    Google Scholar 

  15. Lapatovich, W.P., Ahmad-Bitar, R., Moskowitz, P.E., Renhorn, I., Gottcho, R.A., Pritchard, D.E.: J. Chem. Phys.73, 5419 (1980)

    Google Scholar 

  16. Aquilanti, V., Casavecchia, P., Grossi, G., Lagana, A.: J. Chem. Phys.73, 1173 (1980)

    Google Scholar 

  17. Nikitin, E.E.: J. Chem. Phys.43, 744 (1965)

    Google Scholar 

  18. Dashevskaya, E.I., Nikitin, E.E., Reznikov, A.I.: J. Chem. Phys.53, 1175 (1970)

    Google Scholar 

  19. Masnou-Seeuws, F., McCarroll, R.: J. Phys. B7, 2230 (1974)

    Google Scholar 

  20. Dashevskaya, E.I.: Chem. Phys. Lett.11, 184 (1971)

    Google Scholar 

  21. Edmonds, A.R.: Angular momentum in quantum mechanics. Princeton: Princeton Univ. Press 1960

    Google Scholar 

  22. Smith, F.J.: Physica30, 497 (1964)

    Google Scholar 

  23. Reid, R.H.G.: J. Phys. B6, 2018 (1973)

    Google Scholar 

  24. Baylis, W.A.: J. Chem. Phys.51, 265 (1969)

    Google Scholar 

  25. Berg, F. Van den, Morgenstern, R.: Chem. Phys.90, 125 (1984)

    Google Scholar 

  26. Düren, R., Raabe, G.P., Schlier, Ch.: Z. Phys.214, 410 (1968)

    Google Scholar 

  27. Düren, R., Hasselbrink, E., Moritz, G.: Z. Phys. A — Atoms and Nuclei307, 1 (1982)

    Google Scholar 

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Author notes

  1. F. van den Berg

    Present address: Physics Department, Technische Hogeschool, Eindhoven

Authors and Affiliations

  1. Fysisch Laboratorium, Rijksuniversiteit Utrecht, The Netherlands

    F. van den Berg, P. Bijl & R. Morgenstern

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  1. F. van den Berg
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  2. P. Bijl
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  3. R. Morgenstern
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Additional information

Dedicated to Prof. O. Osberghaus on the occasion of his 65th birthday

We thank Prof. Dr. C. Th. J. Alkemade for helpful conversations and suggestions. We are grateful to Prof. Dr. Düren and Dr. E. Hasselbrink for performing and providing close coupling calculations on the Na*-Ne system. This work was performed as part of the research programme of the “Stichting voor Fundamenteel Onderzoek der Materie”, which is financially supported by the “Nederlandse Organisatie voor Zuiver Wetenschappelijk Onderzoek (ZWO)”.

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van den Berg, F., Bijl, P. & Morgenstern, R. The effect of electron-spin uncoupling on differential scattering cross sections for excited alkalirare gas systems. Z Physik A 320, 1–10 (1985). https://doi.org/10.1007/BF01411920

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  • DOI: https://doi.org/10.1007/BF01411920

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