Infrared multiple photon dissociation spectra for size-selected water cluster anions , , are presented covering the frequency range of . The cluster ions are trapped and cooled by collisions with ambient He gas at , with the goal of defining the cluster temperature better than in previous investigations of these species. Signal is seen in two frequency regions centered around 700 and , corresponding to water librational and bending motions, respectively. The bending feature associated with a double-acceptor water molecule binding to the excess electron is clearly seen up to , but above ; this feature begins to blueshift and broadens, suggesting a more delocalized electron binding motif for the larger clusters in which the excess electron interacts with multiple water molecules.
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