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Overall charge unchanged: Disulfide bonds in gaseous polypeptide cations can be cleaved efficiently by ultraviolet photodissociation (UVPD) at 157 nm (see scheme). Unlike electron-capture dissociation, UVPD cleaves SS bonds without overall charge reduction in the product ions. This cleavage is suggested to be a result of electronic excitation caused by the absorption of photons of 7.9 eV.
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Fung et al. (2005) studied this question.
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