Since information about molecular weight can be obtained easily using chemical ionization (CI), accurate qualification is possible.
When analyzing mass spectra, first molecular ions...
When analyzing mass spectra, first molecular ions...
CI is a softer ionization method than EI, fragmentation is less likely to occur, so molecular weight information is more readily obtained. Negative chemical ionization (NCI) or negative ion chemical ionization (NICI) enables selectively measuring, with ultra high sensitivity, chemical substances with an electron affinity, such as chlorine-based compounds.