Microwave Spectra and Structures of H_2O-AgCl and H_3N-AgCl.

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Mini-Symposium: Metal Containing Molecules

Scientific paper

A Balle-Flygare FT-MW spectrometer coupled to a laser ablation source has been used to measure the pure rotational spectra of H2O-AgCl and H3N-AgCl. Both molecules are generated via laser ablation (532 nm) of a metal rod in the presence of CCl4, argon, a low partial pressure of H2O or NH3 and are stabilized by supersonic expansion. Rotational constants and centrifugal distortion constants have been measured for eight isotopologues of H2O-AgCl with substitutions at the silver, chlorine, oxygen and hydrogen atoms. B0 and C0 have been independently determined for six isotopologues and the spectra are consistent with a linear arrangement of oxygen, silver and chlorine atoms. The structure is either C2v planar at equilibrium or CS pyramidal but with a low potential-energy barrier to planarity such that the v=0 and 1 states associated with the motion that inverts the configuration at the O atom are well separated. Preliminary data from a study of H3N-AgCl will also be presented. Several transitions have been observed and tentatively assigned to hyperfine components of the 202-101, 303-202 and 404-303 transitions of H3N-107Ag35Cl and H3N-109Ag35Cl. These data are consistent with a C3v structure.

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