1962 Volume 35 Issue 2 Pages 211-214
Using a mass spectrometer, the nature of the mass spectrum produced by the spark ionization source of semi-metallic and metallic elements and of ionic-crystals was studied, and it was found that only semi-metallic elements are capable of producing their polyatomic ions in a significant concentration.
When the samples of alkali halide single crystals were taken out from the spark source after sparking, it was observed that the crystals held their shape and, moreover, that color centers had been formed finely.
In the light of the experimental results, the mechanism of the ion formation in the spark was discussed, and it was pointed out that some relation might exist between the crystal structure of the solid sample and the formation of the gaseous molecular ion.
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