Abstract
With our “Inverted Doppler Shift Attenuation (IDSA)” method stopping cross sections for swift ions can be measured with an accuracy of about 1%. We report here on results with lithium and carbon projectiles in very different stopping materials. It turns out that the stopping cross section around Bohr's velocity is linearly dependent on the velocity. Stopping cross sections of elements show the expected Z 2-oscillations. With compound targets we found strong deviations from Bragg's rule which means that the stopping cross section is influenced by the chemical bonding. In electrolytic solutions effects due to ion-dipole interactions can be observed. These phenomena demonstrate the strong sensitivity of electronic stopping cross sections on the specific distribution of the outer electrons of the target atoms. Further we have modified Lindhard's formula which gives a good description of this influence.
Published Version
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