has participant laser desorption-ionisation mass spectrometry matrix-assisted laser desorption-ionisation mass spectrometry CHMO:0000519 FIX:0000001 Mass spectrometry where the sample (usually a large organic molecule or biomolecule) is vaporised and ionised using a high-energy pulsed laser. The sample is held in a matrix (such as crystallised dihydrobenzoic acid) to protect it from direct laser illumination and to separate the sample molecules. MALDI MS matrix-assisted laser desorption ionization (MALDI) MS MALDI-MS matrix-assisted laser desorption-ionization mass spectroscopy matrix-assisted laser desorption-ionisation mass spectroscopy MALDIMS matrix assisted laser desorption-ionisation mass spectrometer