Abstract
The Z 1 4-correction to the electronic stopping cross section of a quantal harmonic oscillator has been evaluated accurately. The calculation is performed within the impact parameter description, where the projectile is assumed to follow a straight line trajectory during the collision. By applying the third Born approximation the impact parameter dependent energy loss to the oscillator is determined to the fourth order in the interaction. The corresponding Z 1 4-correction to the stopping cross section is found by integrating over all impact parameters, and the results are compared with the Bloch estimate. For large impact parameters the classical limit of the Z 1 4-correction is evaluated and simple estimates of the overall stopping cross section are derived from this limit. Comparison with experiments is made on the basis of an oscillator model of atomic stopping, and the agreement is found to be good.
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