Collisions of the Second Kind between Ions and Atoms or Molecules
SOME experiments dealing with collisions of the second kind between ions and atoms or molecules have been performed independently and simultaneously in two different laboratories—one at Princeton University and one at the University of California. Through correspondence the different investigators have learned of each other's results and have decided to present jointly, in this letter, a preliminary report of this phenomenon, which heretofore has been unknown. In both researches, the apparatus used are essentially those described in the positive ray experiments by Smyth (Proc. Roy. Soc. and Phys. Rev.) and by Hogness and Lunn (Phys. Rev.). One set of experiments is the preliminary stage of a complete study of the whole phenomenon; the other is incidental to work on the positive ray analysis of nitric oxide.