The stopping power, expressed in electron volts per atom of gas per square centimeter has been measured in H₂, He, air, and argon for lithium ions in the kinetic energy range 100-450 kev. Collisions which would have deviated the lithium ions as much as 10^-3 radian would have removed them from the detector aperture, so that the measured stopping power arises entirely from electronic collisions. The following results were obtained:
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Allison et al. (1956) studied this question.
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