Organic secondary ion mass spectrometry: Signal enhancement by water vapor injection
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- Mouhib, T., Delcorte, A., Poleunis, C. et al. J Am Soc Mass Spectrom (2010) 21: 2005. doi:10.1016/j.jasms.2010.08.013
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The enhancement of the static secondary ion mass spectrometry (SIMS) signals resulting from the injection, closely to the sample surface, of H2O vapor at relatively high-pressure, was investigated for a set of organic materials. While the ion signals are generally improved with increasing H2O pressure upon 12 keV Ga+ bombardment, a specific enhancement of the protonated ion intensity is clearly demonstrated in each case. For instance, the presence of H2O vapor induces an enhancement by one order of magnitude of the [M+ H]+ static SIMS intensity for the antioxidant Irgafos 168 and a ∼1.5-fold increase for polymers such as poly(vinyl pyrrolidone).