MALDI ionization mechanisms investigated by comparison of isomers of dihydroxybenzoic acid
2016
Kirmess, Kristopher M. | Knochenmuss, Richard | Blanchard, Gary J. | Kinsel, Gary R.
Matrix‐assisted laser desorption/ionization (MALDI) ion formation mechanisms were investigated by comparison of isomers of dihydroxybenzoic acid (DHB). These exhibit substantially different MALDI performance, the basis for which was not previously understood. Luminescence decay curves are used here to estimate excited electronic state properties relevant for the coupled chemical and physical dynamics (CPCD) model. With these estimates, the CPCD predictions for relative total ion and analyte ion yields are in good agreement with the data for the DHB isomers. Predictions of a thermal equilibrium model were also compared and found to be incompatible with the data.
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