Research Article

On the Primary Ionization Mechanism(s) in Matrix-Assisted Laser Desorption Ionization

Table 1

Dissociation energy ( ) of aromatic carboxylic acid dimers (see Scheme 2).

Dimers (eV) (eV) (eV)

Benzoic acid7.033.683.50
2,5-dihydroxybenzoic acid6.71
4-methoxybenzoic acid6.79
4-nitrobenzoic acid6.94
4-N,N-dimethylaminobenzoic acid6.56