positive ion laser desorption mass spectrometry matrix-assisted laser desorption-ionisation time-of-flight mass spectrometry positive ion matrix-assisted laser desorption–ionisation time-of-flight mass spectrometry positive ion matrix assisted laser desorption ionisation time-of-flight mass spectrometry positive ion matrix assisted laser desorption/ionization time of flight mass spectrometry positive ion matrix assisted laser desorption/ionization time of flight mass spectroscopy 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. The positive sample ions are accelerated to the same (known) kinetic energy and the time taken for each ion to reach a detector at a known distance is measured. This time is dependent on the mass-to-charge ratio of the ion. positive ion MALDI-TOF-MS positive ion matrix assisted laser desorption/ionisation time of flight mass spectrometry positive ion MALDI-TOF/MS positive ion matrix assisted laser desorption ionization time of flight mass spectroscopy positive ion matrix-assisted laser desorption-ionisation time-of-flight mass spectrometry positive ion matrix assisted laser desorption ionisation time of flight mass spectroscopy positive ion matrix-associated laser desorption/ionization-time of flight mass spectrometry https://orcid.org/0000-0001-5985-7429 positive ion matrix-assisted laser desorption ionization (MALDI-TOF) mass spectrometry (MS) 2010-01-04T03:21:27Z positive ion MALDI-TOF MS positive ion matrix assisted laser desorption/ionisation time of flight mass spectroscopy CHMO:0002650 positive ion MADI-TOF MS positive ion matrix assisted laser desorption ionization time of flight mass spectrometry positive ion matrix assisted laser desorption ionisation time of flight mass spectrometry