Heidelberg 1999 – wissenschaftliches Programm

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SYCF: Symposium Cluster und Fullerene

SYCF 5: Cluster und große Moleküle (Poster)

SYCF 5.8: Poster

Dienstag, 16. März 1999, 16:00–19:00, PA

High Resolution Infrared Spectrum of the ν₃ Band in Ar-HCO⁺ — •H. Linnartz, T. Speck, and J.P. Maier — Institute for Physical Chemistry, University of Basel, Klingelbergstrasse 80, CH4056 Basel

Spectroscopic properties of Ar-HCO⁺ have been studied by exciting the C-O stretch of the HCO⁺ chromophore. The ionic complex is generated in a slit jet expansion with subsequent electron impact ionization. The spectra are obtained by direct absorption spectroscopy using a tuneable diode laser and production modulation. The ν₃ band of the Ar-HCO⁺ is rotationally resolved and has a form consistent with a linear proton-bound complex. The band origin is at 2135.7073(4) cm⁻¹ which is 48.24 cm⁻¹ red-shifted to the value in free HCO⁺. This indicates that the coupling of the C-O stretch to the intermolecular bond is still considerable.