Coherent excitation of H(n=2) in H+, H - He collisions

  • R. Hippler
  • O. Plotzke
  • W. Harbich
  • H. Madeheim
  • H. Kleinpoppen
  • H. O. Lutz


The coherent excitation of H(n=2) in H+, H - He collisions was investigated at incident energies of 5–25 keV. From a polarization analysis of the emitted Lyman-α radiation as a function of an external electric field, the partial cross sections for excitation to the H(2s) and the H(2pm) magnetic substates and the real part of thesp0-coherence were extracted. For H+-He collisions, the measured partial cross sections are in fair agreement with previous two-electron calculations by Kimura and Lin; the agreement with one-electron calculations of Jain et al. is, particularly at the lower incident energies, less satisfactory. For both collision systems, an energy-dependent forward-backward asymmetry corresponding to a shift of the center-of-charge relative to the center-of-mass (dipole moment) was observed. In H+ - He collisions, the measured dipole moment was positive; it thus corresponds to an electron trailing behind the proton. The same analysis applied to the H - He system showed the electron riding in front of the proton.


34.50.Fa 34.70.+e 32.60.+i 


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  1. 1.
    Jain, A., Lin, C.D., Fritsch, W.: Phys. Rev. A36, 2041 (1987); Fritsch, W.: private communication (1990)Google Scholar
  2. 2.
    Havener, C.C., Rouze, N., Westerveld, W.B., Risley, J.S.: Phys. Rev. Lett.53, 1049 (1984);Google Scholar
  3. 2a.
    Ashburn, J.R., Cline, R.A., Stone, C.D., van der Burgt, P.J.M., Westerveld, W.B., Risley, J.S.: Phys. Rev. A40, 4885 (1989)Google Scholar
  4. 3.
    e.g., Meckbach, W., Vidal, R., Focke, P., Nemirowsky, I.B., Gonzalez-Lepera, E.: Phys. Rev. Lett.52, 621 (1984)Google Scholar
  5. 4.
    Fano, U., Macek, J.: Rev. Mod. Phys.45, 553 (1973)CrossRefGoogle Scholar
  6. 5.
    Blum, K., Kleinpoppen, H.: Phys. Reports52, 203 (1979); Phys. Reports96, 251 (1983)Google Scholar
  7. 6.
    Hippler, R.: In: Fundamental processes in atomic collision physics. Kleinpoppen, H., Briggs, J.S., Lutz, H.O. (eds.), p. 181. New York: Plenum 1985Google Scholar
  8. 7.
    e.g., Hippler, R.: In: XV ICPEAC Electronic and Atomic Collisions, Book of invited Papers. Gilbody, H.B., Newell, W.R., Read, F.H., Smith, A.C.H. (eds.), p. 241. Amsterdam:Elsevier 1987;Google Scholar
  9. 7a.
    Coherence in atomic collision physics. Beyer, H.J., Blum, K., Hippler, R. (eds.). New York: Plenum 1988;Google Scholar
  10. 7b.
    Hippler, R.: In: Proc. VIth Int. Symp. Polarization and Correlation in Electronic and Atomic CollisionsGoogle Scholar
  11. 8.
    Eck, T.G.: Phys. Rev. Lett.31, 270 (1973)Google Scholar
  12. 9.
    Andrä, H.J.: In: Progress in atomic spectroscopy, Part B. Hanle, W., Kleinpoppen, H. (eds.), p. 829. Plenum: New York 1978Google Scholar
  13. 10.
    Kollath, K.J., Standage, M.C.: In: Progress in atomic spectroscopy, Part B. Hanle, B.W., Kleinpoppen, H. (eds.), p. 955. Plenum: New York 1978Google Scholar
  14. 11.
    Sellin, I.A., Mowat, J.R., Peterson, R.S., Griffin, P.M., Laubert, R., Haselton, H.H.: Phys. Rev. Lett.31, 270 (1973)Google Scholar
  15. 12.
    Gaupp, A., Andrä, H.J., Macek, J.: Phys. Rev. Lett.32, 268 (1974)Google Scholar
  16. 13.
    Sellin, I., Liljeby, L., Mannervik, S., Hultberg, S.: Phys. Rev. Lett.42, 570 (1979)Google Scholar
  17. 14.
    DeSerio, R., Gonzalez-Lepera, C., Gibbons, J.P., Burgdörfer, J., Sellin, I.A.: Phys. Rev. A37, 4111 (1988)Google Scholar
  18. 15.
    Back, C.G., Watkin, S., Eminyan, M., Rubin, K., Slevin, J., Woolsey, J.M.: J. Phys. B17, 2695 (1984);Google Scholar
  19. 15a.
    Chwirot, S., Legowski, S., Slevin, J., Zaremba, J.: J. Phys. B22, 1411 (1989)Google Scholar
  20. 16.
    Heck, E.L., Williams, J.F.: J. Phys. B20, 2871 (1987);Google Scholar
  21. 16a.
    Williams, J.F., Heck, E.L.: J. Phys. B21, 1627 (1988)Google Scholar
  22. 17.
    Mahan, A.H., Smith, S.J.: Phys. Rev. A16, 1789 (1977)Google Scholar
  23. 18.
    Krotkov, R., Stone, J.: Phys. Rev. A22, 473 (1980)Google Scholar
  24. 19.
    Aynacioglu, A.S., Heumann, S., von Oppen, G.: Phys. Rev. Lett.64, 1879 (1990)Google Scholar
  25. 20.
    Lüders, G.: Z. Naturforsch.5a, 608 (1950);Google Scholar
  26. 20a.
    Ann. Phys. (Leipzig), Band8, 301 (1951)Google Scholar
  27. 21.
    Harbich, W., Hippler, R., Kleinpoppen, H., Lutz, H.O.: Phys. Rev. A39, 3388 (1989)Google Scholar
  28. 22.
    Harbich, W.: Dissertation, Universität Bielefeld (1988);Google Scholar
  29. 22a.
    Plotzke, O.: Diplomarbeit, Universität Bielefeld (1990)Google Scholar
  30. 23.
    Hippler, R., Faust, M., Wolf, R., Kleinpoppen, H., Lutz, H.O.: Phys. Rev. A31, 1399 (1985); Phys. Rev. A37, 4644 (1987);Google Scholar
  31. 23a.
    Hippler, R., Madeheim, H., Harbich, W., Kleinpoppen, H., Lutz, H.O.: Phys. Rev. A38, 1662 (1988)Google Scholar
  32. 24.
    Hippler, R., Harbich, W., Faust, M., Lutz, H.O.: J. Phys. B21, 103 (1988)Google Scholar
  33. 25.
    Madeheim, H., Hippler, R., Lutz, H.O.: Z. Phys. D — Atoms, Molecules and Clusters15, 327 (1990)Google Scholar
  34. 26.
    Stone, C.R.: Ph. D. Thesis, North Carolina State University (1986)Google Scholar
  35. 27.
    Hippler, R., Harbich, W., Madeheim, H., Kleinpoppen, H., Lutz, H.O.: Phys. Rev. A35, 3139 (1987)Google Scholar
  36. 28.
    Kimura, M., Lin, C.D.: Phys. Rev. A34, 176 (1986)Google Scholar
  37. 29.
    Jaecks, D.H., Van Zyl, B., Geballe, R.: Phys. Rev.137, A 340 (1965)Google Scholar
  38. 30.
    Andreev, E.P., Ankudinov, V.A., Bobashev, S.V.: Sov.-Phys. JETP23, 375 (1966)Google Scholar
  39. 31.
    Hippler, R., Harbich, W., Faust, M., Lutz, H.O., Dubé, L.: J. Phys. B19, 1507 (1986);Google Scholar
  40. 31a.
    Hippler, R., Madeheim, H., Lutz, H.O., Kimura, M., Lane, N.F.: Phys. Rev. A40, 3446 (1989)Google Scholar
  41. 32.
    Teubner, P.J.O., Kaupilla, W.E., Fite, W.L., Girnius, R.J.: Phys. Rev. A2, 1763 (1970)Google Scholar
  42. 33.
    Birely, J.H., McNeal, R.J.: Phys. Rev. A5, 257 (1972)Google Scholar
  43. 34.
    Orbeli, A.L., Andreev, E.P., Ankudinov, U.A., Pukelski, U.M.: Sov.-Phys. JETP30, 63 (1970)Google Scholar
  44. 35.
    Flannery, M.R.: J. Phys. B2, 913 (1969)Google Scholar
  45. 36.
    Levy, H.: Phys. Rev.187, 136 (1969); Phys. Rev. A1, 750 (1970)Google Scholar
  46. 37.
    Bell, K.L., Kingston, A.E., McIlveen, W.A.: J. Phys. B6, 1237 and 1246 (1973);Google Scholar
  47. 37a.
    Bell, K.L., Kingston, A.E., Winter, T.G.: J. Phys. B7, 1369 (1974)Google Scholar
  48. 38.
    Ast, H., Lüdde, H.J., Dreizler, R.M.: J. Phys. B23, 2305 (1990)Google Scholar
  49. 39.
    Kimura, M., Lane, N.F.: Phys. Rev. A37, 2900 (1988)Google Scholar
  50. 40.
    Grosser, J., Krüger, W.: Z. Phys. A — Atoms and Nuclei318, 25 (1984)Google Scholar
  51. 41.
    Dose, V., Gunz, R., Meyer, V.: Helv. Phys. Acta41, 264 (1968)Google Scholar

Copyright information

© Springer-Verlag 1991

Authors and Affiliations

  • R. Hippler
    • 1
  • O. Plotzke
    • 1
    • 2
  • W. Harbich
    • 1
    • 3
  • H. Madeheim
    • 1
  • H. Kleinpoppen
    • 1
  • H. O. Lutz
    • 1
  1. 1.Fakultät für PhysikUniversität BielefeldBielefeld 1Germany
  2. 2.Fritz-Haber-Institut, Abt. OberflächenphysikBerlin 33Germany
  3. 3.Departement Physique Expérimentale, EcublensEcole Polytechnique Fédérale de LausanneLausanneSwitzerland

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