CHEM 367 Study Guide - Final Guide: Corona Discharge, Ionization, Mass Spectrometry
5 Jan 2017
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Eic: detects a range of ions at a specified time interval, single ion monitoring, when monitoring one or few, total ion chromatogram, sum of all ms signal peak, extracted ion chromatogram, created from a single ms ion, good for analyzing analytes multicomponent samples and unknowns, depending on mass analyzer can give better sensitivity and quantitative data compared to scan mode intensities (m/z) belonging to the same ms scan plotted over time peak intensity in one ms scan plotted over time, specifies which m/z value to look at. Apci: hard ionization, shoots a beam of, less harsh than ei, electron beam, soft ionization, liquid sample electrons at analyte, gas samples. Known compounds: only for +ve mode passes through a cloud of chemical gas, obtains protonated molecule in +ve mode sprayed with air towards electrodes. Inlet methods by infusion lc, ce: obtain molecular, allows ms of ion peak, works for +ve & ve modes.
