Abstract
The two-photon ionization spectra (wavelength dependence of the photoionization charge) of the three title molecules have been measured on the water surface in the region of 340-440nm using a Ti-sapphire laser. The signal was quadratic to the laser pulse energy. The peaks in the observed spectra are closely correlated with those in the one-photon absorption spectra in solution. The detection limit depended on the wavelength used and was better at band peaks in the photoionization spectrum.
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