The photophysics of some UV-MALDI matrices studied by using spectroscopic, photoacoustic and luminescence techniques

The photophysical behaviour of classical UV-MALDI matrices 2,5-dihydroxybenzoic acid (gentisic acid; GA), 2,4,6-trihydroxyacetophenone (THAP), trans-3,5-dimethoxy-4-hydroxycinnamic acid (SA), trans-4-hydroxy-α-ciano-4-hydroxycinnamic acid (CHC), 9H-pirido[3,4-b]indole (nor-harmane; norHo) and 1-methyl-9H-pirido[3,4-b]indole (harmane; Ho) in acetonitrile was studied by using spectroscopic, luminescence and photoacoustic techniques.