Berlin 2001 – wissenschaftliches Programm

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AMPD: EPS AMPD

AMPD 10: Sitzung 10

AMPD 10.3: Vortrag

Freitag, 6. April 2001, 11:20–11:45, H104

MANY–BODY PHENOMENA IN ELECTRON–CLUSTER COLLISIONS — •Andrey V. Solov’yov — A.F. Ioffe Physical–Technical Institute, 194021 St Petersburg, Russia

This contribution is primarily focused on many–body phenomena manifesting themselves in electron scattering on fullerenes and metal clusters, however, some of the results of this consideration are applicable to other types of clusters as well.

Metallic clusters are characterized by the property that their valence electrons are fully delocalized [1,2]. To some extent this feature is also valid for fullerenes, for which the delocalization of electrons takes place in the vicinity of the fullerene’s cage. When considering electron collisions involving metal clusters and fullerens, often, namely the valence delocalized electrons play the most important role in the formation of the cross sections of various collision processes.

In this review we discuss electron collisions with metal clusters and fullerenes, being in a gas phase, and focus on the following physical problems: manifestation of electron diffraction both in elastic and inelastic collisions [3,4], the role of multipole surface and volume plasmon excitations in the formation of electron energy loss spectra (differential and total, above and below ionization potential) as well as the total inelastic scattering cross sections [3,4], importance of the polarization effects in electron attachment process [5]; mechanisms of electron excitation width formation and relaxation of electron excitations in metal clusters [6]. The choice of these problems is made, because of their close links to the experiments performed in the field.

The solutions of the outlined problems problems are given on the basis of the consistent many-body theory developed with the Hartree–Fock jellium model wave functions. Many electron correlations in the system are taken into account, where it is necessary, using the random phase approximation with exchange and the Dyson equation method. These approaches are very well known in atomic and nuclear physics. Their effective use for clusters is one of the great advantages of the jellium model, which serves as a good basis for the electron scattering theory on metal clusters and fullerens.

[1] Bréchignac C., Connerade J.P., J. Phys. B 27 (1994) 3795.

[2] Ekardt W. (ed.) "Metal Clusters", Wiley, New York (1999).

[3] Connerade J.P., Gerchikov L.G., Ipatov A.N., Polozkov R.G., Solov’yov A.V., Greiner W., J. Phys. B 30 (1997) 4133–4161; J. Phys. B 30 (1997) 5939–59359; J. Phys. B 31 (1998) 3065–3077; Phys. Rev. A 62 (2000) 043201.

[4] Gerchikov L.G., Efimov P.V., Mikoushkin V.M., Solov’yov A.V., Phys. Rev. Lett. 81 (1998) 2707–2710.

[5] Connerade J.P.,Gerchikov L.G., Ipatov A.N., Solov’yov A.V., J. Phys. B 29 (1996) 365–375; J. Phys. B 29 (1996) 3529–3547; Z. Phys. D 42 (1997) 279–287; J. Phys. B 31 (1998) L27–L34; J. Phys. B 31 (1998) 2331–2341; J. Phys. B 32 (1999) 877–894.

[6] Gerchikov L.G., Ipatov A.N., Solov’yov A.V., Greiner W., Int. Journal of Modern Physics E 8 (1999) 289–298; J. Phys. B 33 (2000) 4905–4926.