WATER-IN-OIL MICROEMULSIONS AS SOLVENTS FOR LASER-EXCITED MULTIPHOTON PHOTOIONIZATION

Laser-excited multiphonon photoionization spectroscopy in polar liquid solutions is impeded by relatively high noise levels. Detection limits are 2-3 orders of magnitude worse than in apolar solvents. Water-in-oll microemulsions of water/AOT [sodium bis(2-ethylhexyl) sulfosuccinate]l n-heptane were evaluated as alternative solvents for polar analytes. Dispersion of water/surfactant aggregates in heptane added excess low-frequency noise relative to pure heptane, but it was possible to filter out the excess noise

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