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Il Nuovo Cimento D

, Volume 9, Issue 1, pp 97–113 | Cite as

Absolute double differential ionization cross-section for electron impact: He

  • L. Avaldi
  • R. Camilloni
  • E. Fainelli
  • G. Stefani
Article

Summary

A complete set of absolute double differential cross-section (DDCS) for electron impact ionization of helium has been measured at an incident energyE0=500 eV. The angular distributions of the ejected and scattered electrons between 40 and 435.5 eV have been measured over the angular range of (10÷145)o. This work supplements the mapping of DDCS for ejected electron energies close to (E0IP)/2 (IP is the He 1s ionization energy), a region where the experimental data are fragmentary. The possibility of representing the full Bethe surface with a simple functional form is investigated.

PACS. 34.80

Electron scattering 

Riassunto

In questo lavoro si presenta un set completo di misure assolute della sezione d’urto doppiamente differenziale di ionizzazione dell’atomo di elio per impatto di elettroni di 500 eV. Sono state misurate le distribuzioni angolari tra 10° e 145° sia degli elettroni emessi che di quelli diffusi con energie comprese tra 40 e 435.5 eV. Il lavoro si propone di contribuire alla definizione della sezione d’urto doppiamente differenziale dell’elio per energie dell’elettrone emesso prossime a (E0IP)/2, oveE0 è l’energia incidente eIP l’energia di ionizzazione dello stato 1s. Infatti i dati sperimentali esistenti in questa regione energetica sono scarsi. Si studia la possibilità di rappresentare tutta la superficie di Bethe con una forma funzionale semplice.

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Copyright information

© Società Italiana di Fisica 1987

Authors and Affiliations

  • L. Avaldi
    • 1
  • R. Camilloni
    • 1
  • E. Fainelli
    • 1
  • G. Stefani
    • 1
  1. 1.Istituto di Metodologie Avanzate Inorganiche del C.N.R.MonterotondoItalia

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