THE PHOTODETACHMENT SPECTRA OF NEGATIVE CLUSTER IONS OF WATER

We have recorded the photoelectron spectra of the water negative cluster ions: $(H 2 O) n − =2,6,7,10−25,30,34,37,40,(D 2 0) n =2,6,7,11−23 −, A r (H 2 0) n −2,6,7 −$ , and $A r (D 2 0) N =2,6,7 −$ , using 2.409 eV photons. The vertical detachment energies of most of these anions were found to increase smoothly with cluster size with their extrema ranging from 0.040 eV for $(H 2 0) 2 −$ to 1.79 eV for $(H 2 O) 40 −$ . The case of the water dimer anion is especially interesting. Its photolectron spectrum consists of three peaks, two of which are spaced to the low electron kinetic energy side of the largest. origin-containing peak by energies which are characteristic of a water stretch and a water bend. Photodetachment of the deuterated dimer anion confirms this interpretation. This implies that at least one water component within the water dimer anion is structurally distorted.

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Author Institution: Dept. of Chemistry, The Johns Hopkins University; Dept. of Physics, Universitat Freiburg; Dept. of Chemistry, The Johns Hopkins University; Dept. of Physics, Universitat Freiburg; Dept. of Chemistry, The Johns Hopkins University

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http://hdl.handle.net/1811/17595

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Abstracts of OSU International Symposium on Molecular Spectroscopy 1980-1989

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