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PHOTOELECTRON AND INFRARED SPECTRA OF (H₂O)_n^- CLUSTERS: NEW ISOMERS AND THE SPECTRAL IDENTIFICATION OF ELECTRON BINDING MOTIFS.

JOSEPH R. ROSCIOLI, JOSEPH C. BOPP, NATHAN I. HAMMER, MARK A. JOHNSON, Sterling Chemistry Laboratory, Yale University, PO Box 208107, New Haven, CT 06520.

We present infrared and photoelectron spectra of the argon-solvated water hexamer and heptamer anions. The photoelectron spectra of both species are dominated by two prevalent isomer classes, I and II. However, the heptamer develops a new, high-binding isomer class when more than seven argon atoms are attached. We also present recently obtained HOH bending spectra of large, warm water cluster anions, and find a prominent transition corresponding to a double-acceptor (AA) water molecule. This suggests the presence of the AA binding motif in isomer I into the large size regime.