Abstract
The drift of positrons under the action of an electric field in Kapton has been observed by using a variable-energy positron beam and the Doppler broadening technique. Even if the maximum applied field (2 MV/cm) is so high that the electrostatic work for a displacement of less than 0.15 nm is larger than the thermal energy, the experimental data can be fit by the diffusion model with a field-independent mobility. The best-fit value of the mobility (ca. 1×10−3 cm2 V−1 s−1) is extremely low in comparison with other dielectrics. The results are discussed with regards to the interaction of positrons with the molecular field.
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References
W. Brandt, A. Dupasquier (eds.): Positron Solid State Physics (North-Holland, Amsterdam 1983)
P. Hautojärvi (ed.): Positrons in Solids, Topics Current Physics, vol. 12 (Springer, Berlin, Heidelberg 1979)
E. Soininen, H. Huomo, P.A. Huttunen, J. Makinen, A. Vehanen, P. Hautojärvi: Phys. Rev. B 41, 6227 (1990)
Y. Kong, K.G. Lynn: Phys. Rev. B 41, 6179 (1990); ibidem, 6185
I.K. MacKenzie, P.Z. Ghorayshi: Solid State Commun. 55, 125 (1985)
J. Makinen, C. Corbel, P. Hautojärvi, A. Vehanen: Phys. Rev. B 42, 1750 (1990)
H. Huomo, E. Soininen, A. Vehanen: Appl. Phys. A 49, 647 (1989)
I.K. MacKenzie: [Ref. 1, p. ]
A. Dupasquier, L. Quartapelle: Appl. Phys. A 44, 239 (1987)
S. Valkealathi, R.M. Nieminen: Appl. Phys. A 35, 51 (1988)
K.O. Jensen, A.B. Walker, N. Bouarissa: In Positrons Beams for Solid and Surfaces, ed. by P.J. Schultz, G.R. Massoumi, P.J. Simpson (AIP Conf. Proceed. 218, 19 (1990))
I.V. Bulgarovskaya, L.A. Novakovskaya, Yu.G. Fyodorov, Z.v. Zvonkova: Kristallografiya 21, 515 (1976)