Hannover 2003 – scientific programme
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MO: Molekülphysik
MO 4: Kleine molekulare Cluster
MO 4.4: Talk
Tuesday, March 25, 2003, 14:45–15:00, B 305
Rotationally resolved infrared spectrum of the charge transfer complex [Ar-N2]+ — •Harold Linnartz1,2, Dorinel Verdes1, and John P. Maier1 — 1Departement Chemie, Universität Basel, Klingelbergstrasse 80, CH-4056 Basel — 2Fysische Chemie, FC-FEW-VU, De Boelelaan 1083, NL-1081 HV Amsterdam
Difficulties in preparing cluster ions for high resolution spectroscopic
studies have limited our understanding of intermolecular forces in charged
complexes that are typical of many reactive intermediates. In this
contribution
the infrared spectrum of the charge transfer complex [Ar-N2]+,
recorded
in a supersonic planar plasma with a tunable diode laser spectrometer, is
presented. More than 70 adjacent rovibrational transitions were measured
near
2272 cm−1 and assigned to the molecular nitrogen stretching
fundamental in
the 2Σ+ ground state. An example is given in the figure. The
accurate structural parameters that are determined confirm a linear
structure
and show that the major part of the charge is located at the argon atom.
The latter result is surprising and implies a charge switch of the cationic
center upon complexation.
More information is available from H. Linnartz, D. Verdes and J.P. Maier,
Science 297 (2002) 1166.