Critical analysis of the modified firsov model. sensitivity to the choice of atomic wavefunctions |
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| Authors: | S A Cruz C Vargas D K Brice |
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| Institution: | 1. Instituto de Física, Universidad de México Apartado , Postal 20-364, México, 20, D.F;2. Instituto de Geofísica, Universidad de México , México, D.F.;3. Sandia Laboratories , Albuquerque, New Mexico, 87185;4. the U.S. Department of Energy DOE, under contract DE-ACO4-76-DP00789 |
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| Abstract: | Abstract The Firsov model for calculating the low-velocity e-lectronic stopping power (Se) as modified by Cheshire, et al, is found to be extremely sensitive to the choice of atomic wave functions (ψ) when a minimum impact parameter is used in the calculations. Differences of a factor of ?2 are observed, for example, between the predicted value of Se using a minimal basis set for ψ and the value obtained using an extended basis set. A systematic analysis to reduce the sources of uncertainty in calculations of S e is proposed in order to have a unified set of criteria regarding the predictions of the theory. |
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