The experiment was performed with a reflectron time-of-flight mass spectrometer containing a continuous supersonic expansion molecular beam source connected to a 3-meter vacuum monochromator and attached to the Chemical Dynamics Beamline (9.0.2) located at the Advanced Light Source. For a detailed description of the instruments, refer to previous studies. The FA is placed in a bubbler at room temperature (vapor pressure of 30 torr at 20 • C), and entrained in argon (460 torr) carrier gas leading to a 6.5 percent molecular beam of FA in argon. To generate a FA water mixture, a second bubbler is introduced inline before the FA bubbler containing water at room temperature (20 • C) leading to a vapor pressure of 17.5 torr. This method of introduction is different from earlier reports where FA and water were mixed in the same reservoir. The gas mixture passes through a 100 µm nozzle source and supersonically expands into a vacuum chamber, yielding the desired FA water molecular beam. This beam is extracted through a skimmer into a deferentially pumped interaction region where the clusters are exposed to and ionized by VUV synchrotron radiation. The ionized species are then detected using a reflectron time-of-flight mass spectrometer. Mass spectra are recorded at photon energies between 9.5 and 14.5 eV every 50 meV. Photoionization efficiency curves, which show ion count versus photon energy (in eV), of the ionized clusters are obtained by integrating over the peaks in the mass spectrum at each photon energy after being normalized by the photon flux.