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An investigation has been made by a mass spectrograph of the ions formed in HCl under electron impact. The following ions were observed: HCl⁺, HCl²⁺, H⁺, Cl⁺, Cl²⁺, Cl³⁺, Cl⁴⁺, Cl⁵⁺, and Cl^-. When He and Ne were used as calibrating gases, the following appearance potentials were determined: HCl⁺, 12.9±{}0.2 volts; HCl²⁺, 35.7±{}1.0; H⁺, 18.6±{}0.3 and 28.4±{}0.3; Cl⁺, 17.2±{}0.5 and 21.2±{}0.5; Cl²⁺, 45.7±{}0.3; Cl³⁺, approximately 160; Cl^-, approximately 1.6 volts. The efficiency of ionization curves were of the usual form. From the ratio of the peak heights of HCl³⁵ to HCl³⁷ the abundance ratio Cl³⁵/Cl³⁷ was found to be 3.07±{}0.03. Cl³⁹ if present was less than 1/20,000 of Cl³⁵.
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Nier et al. (1936) studied this question.
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