Temperature Effects in Chemical Ionization

The chemical ionization studies so far described have been almost completely concerned with the determination of the mass spectra produced from different types of compounds, and attempts have been made to deduce the ionic chemistry involved in the production of the ions observed. It has been hoped and anticipated that a mass spectrometric technique of practical 

The main experimental technique utilized to obtain these types of information is the determination of the variations in chemical ionization mass spectra. as a function of the temperature in the mass spectrometer ionization chamber, and a certain amount of additional information has been obtained from studies of the effect of the pressure of both the additive substance and the reactant gas on the chemical ionization spectra. Some of the measurements made are quite new, and the exact significance of the results obtained is not completely established. However, even though caution must be exercised, it appears that a physical chemistry of the gaseous ionic chemistry involved in chemical ionization is developing. It is to be hoped that comparisons of the physical chemistry of gaseous ionic systems with those of condensed-phase systems will lead to an increase of understanding of both. Thus it seems quite possible that chemical ionization mass spectrometry will have a utility related to the information it provides about chemical systems which will be of importance comparable with its potential analytical importance. 

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