By allowing the positive ions to pass through an electric field and thus giving them a certain velocity, it is possible to distinguish them from the neutral, stationary atoms.

Summary

This quote highlights a technique called electric field separation, which focuses on selectively sorting positive ions from neutral atoms based on their behavior in an electric field. By subjecting these particles to an electric field, they acquire an identifiable velocity. This enables a distinction between positive ions and stationary atoms, allowing for their separation and analysis in various scientific and technological applications.

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