High resolution spectroscopy of small metal clusters

Abstract

The optical absorption spectrum of small lithium clusters has been measured up to Li8. In Li3 high resolution Two Photon Ionization (TPI) spectra have been recorded allowing us to determine the geometry and potential surfaces of the ground and excited states. In larger clusters, the excited states are dissociative and the absorption spectra have been obtained by Depletion Spectroscopy. Vibronic resolution is still achieved in Li4, but not in larger clusters. The measured spectra exhibit a rather small number of transitions to electronically excited states. In Li7, only one intense band is observed in the blue region, while in Li8, an intense band is also observed in the blue region and a much weaker band in the red region. All the obtained results are in very good agreement with the ab initio calculation of Bonacic-Koutecky et al. This demonstrates that molecular effects are always present in these small clusters. The semi-classical models of surface plasma resonances are also discussed.

This is a preview of subscription content, access via your institution.

References

  1. 1.

    Hermann, A., Hoffmann, M., Leutwyler, S., Schumacher, E., Wöste, L.: Chem. Phys. Lett.62 216 (1979)

    Google Scholar 

  2. 2.

    Broyer, M., Delacrétaz, G., Labastie, P., Whetten, R.L., Wolf, J.P., Wöste, L.: Z. Phys. D — Atoms, Molecules and Clusters3 131 (1986)

    Google Scholar 

  3. 3.

    Morse, M.D., Hopkins, J.B., Langridge-Smith, P.R.R., Smalley, R.E.: J. Chem. Phys.79 2598 (1983)

    Google Scholar 

  4. 4.

    Broyer, M., Delacrétaz, G., Guoquan, Ni, Wolf, J.P.: Chem. Phys. Lett.145 232 (1988)

    Google Scholar 

  5. 5.

    Broyer, M., Delacrétaz, G., Labastie, P., Whetten, R.L., Wolf, J.P., Wöste, L.: Phys. Rev. Lett.57 1851 (1986)

    Google Scholar 

  6. 6.

    de Heer, W., Selby, K., Kresin, V., Masui, J., Vollmer, M., Chatelain, A., Knight, W., Phys. Rev. Lett.59 1805 (1987)

    Google Scholar 

  7. 7.

    Wang, C.R.C., Pollack, S., Kappes, M.: Chem. Phys. Lett.166 26 (1990)

    Google Scholar 

  8. 8.

    Bréchignac, C., Cahuzac, P., Carlier, F., Leygnier, J.: Chem. Phys. Lett.164 433 (1989)

    Google Scholar 

  9. 9.

    Jarrold, M.F., Ray, V., Bower, J.E., Creegan, K.M.: J. Chem. Soc. Faraday Trans.86 2537 (1990)

    Google Scholar 

  10. 10.

    Wolf, J.P., Delacrétaz, G., Wöste, L.: Phys. Rev. Lett.63 1946 (1989)

    Google Scholar 

  11. 11.

    Gerber, W.H., Schumacher, E.: J. Chem. Phys.69 1962 (1978); Gerber, W.H., PhD Thesis, Bern, 1980

    Google Scholar 

  12. 12.

    Broyer, M., Chevaleyre, J., Dugourd, Ph., Wolf, J.P., Wöste, L.: (to be published)

  13. 13.

    Bonacic-Koutecky, V.: Private communication

  14. 14.

    Garland, D.A., Lindsay, D.M.: J. Chem. Phys.78 2813 (1983)

    Google Scholar 

  15. 15.

    Howard, J.P., Sutcliffe, R., Mile, B.: Chem. Phys. Lett.112 84 (1984)

    Google Scholar 

  16. 16.

    Bonacic-Koutecky, V., Fantucci, P., Koutecky, J.: (to be published) and paper presented at the conference

  17. 17.

    Selby, K., Vollmer, M., Masui, J., Kresin, V., de Heer, W.A., Knight, W.D.: Phys. Rev. A40, 5417 (1989)

    Google Scholar 

  18. 18.

    Broyer, M., Chevaleyre, J., Dugourd, Ph., Wolf, J.P., Wöste, L.: Phys. Rev. A42, 6954 (1990)

    Google Scholar 

  19. 19.

    Blanc, J., Broyer, M., Chevaleyre, J., Dugourd, Ph., Wolf, J.P., Wöste, L.: (to be published)

Download references

Author information

Affiliations

Authors

Rights and permissions

Reprints and Permissions

About this article

Cite this article

Blanc, J., Broyer, M., Chevaleyre, J. et al. High resolution spectroscopy of small metal clusters. Z Phys D - Atoms, Molecules and Clusters 19, 7–12 (1991). https://doi.org/10.1007/BF01448245

Download citation

PACS

  • 36.40 +d
  • 31.50 +w
  • 35.20i