Ion induced electron emission experiments at the Tandem accelerator

(20 years in 10 minutes) A. Clouvas C. Potiriadis H. Rothard K.O.Groeneveld et al A Xenoulis A. Katsanos M.Farizon, B. Farizon et

al

AUTH , Greece GAEC, Greece CIRIL /GANIL France IKF , Germany Demokritos, Greece Demokritos, Greece IPNL , France

Ionisation of a solid by ions

Experimental set-up

γf γβ γτ

Incident projectile : H, Li, Be, B, C, O, F, Al, Si, Cl, V, Ni , Cu , Ge

Incident charge state Incident projectile velocity Incident target thickness dependence Electron emission from

nanostructured targets

Target thickness dependence γB (d) = Λ dE/dx βs [1-exp(-d/λs)] γF (d) = Λ dE/dx [1- βs exp(-d/λs)]- βδ

[1-exp(-d/λδ)] βs + βδ =1 Λ is a constant depending on the

target material , dE/dx denotes the electronic energy loss per unit path length

2 MeV protons to Carbon

0.6

0.7

0.8

0.9

1

1.1

1.2

1.3

0 50 100 150 200 250 300 350 400

Target thickness (micr ograms per cm2)

Elec

tron

per

ion

γF (d) = Λ dE/dx [1- βs exp(-d/λs)]- βδ [1-exp(-d/λδ)]

γB (d) = Λ dE/dx βs [1-exp(-d/λs)]

Publications in Scientific Journals Influence of the target thickness on the backward and forward electron emission characteristics

induced by protons incident on thin carbon foils    C. Potiriadis, A. Clouvas, H Rothard, N. Pauly ,A. Dubus ,M. Rosler  Nuclear Instruments and Methods in Physics Research B 230, 466-470, (2005)

Electron emission  induced by H+  and  H0  incident on thin carbon foils : influence of charge changing processes  N. Pauly ,A. Dubus ,M. Rosler, H Rothard, A. Clouvas, C. Potiriadis  Nuclear Instruments and Methods in Physics Research B 230, 460-465, (2005)

"Experimental and theoretical study of the ratio between the electron emission yield and the electronic stopping power or photons incident on thin carbon foils" A. Dubus, N. Pauly M. Rosler, H Rothard, M.Beuve, M.Caron, B. Gervais, A. Clouvas, C. Potiriadis Nuclear Instruments and Methods in Physics Research B 193, 621-625, (2002)

"Experimental study and Monte Carlo simulation of the correlation between electron emission and stopping power for swift proton impact on amorphous carbon target" M.Beuve, M.Caron, B. Gervais, H. Rothard, A. Clouvas, C. Potiriadis Eur. Phys. J. D. 15 , 293-300 ,(2001)

"Secondary electron emission near the electronic stopping power maximum" R. Neugebauer, R. Wuensch, T. Jalowy, K. O. Groeneveld, H. Rothard, A. Clouvas, C. Potiriadis, Physical. Review. B, Vol. 59 No. 17 pp. 11113 (1999)

Role of projectile electrons in secondary electron emission from solid surfaces under fast ion bombardment". A. Clouvas, C. Potiriadis, H. Rothard, D. Hofmann, R. Wuensch, K.O. Groeneveld, A. Katsanos,  A.C. Xenoulis. Physical Review B, Vol 55, No 18, pp 86-98 (1997)

"Projectile dependence of ion-induced electron emission from thin carbon foils".  A. Clouvas, A. Katsanos, B. Farizon Mazuy, M. Farizon, M.J. Gaillard, S. Ouaskit.  Physical Review B 48, 6832 (1993).

Heavy ion induced electron emission from thin carbon foils".  A. Clouvas, A. Katsanos, B. Farizon-Mazuy, M. Farizon, M.J. Gaillard.  Physical Review B 43, 2496 (1991).

Secondary electron emission from thin foils under fast ion-bombardment”. A. Clouvas, H. Rothard, M. Burkhard, K. Kroneberger, S.C. Bidermann, J. Kemmler, K.O. Groeneveld, R. Kirsch, P. Misaelides, A. Katsanos. Physical Review B39, 6316 (1989).

What next ? Ion Induced electron emission from

solid surfaces is in a “mature” stage However, still remain some

interesting experiments as : Measurements with “biological”

materials (eg tissue equivalent) and incident alpha particles

Measurements with nanostructured materials

Thank you …..