Berlin 2001 – wissenschaftliches Programm
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MO: Molekülphysik
MO 1: Posters Monday: Clusters, Fullerenes and Nanotubes
MO 1.2: Poster
Montag, 2. April 2001, 12:30–15:00, AT3
Infrared spectroscopy of the molecular complexes H2O-N2O and D2O-N2O — •G. Gimmler und M. Havenith — Lehrstuhl für physikalische Chemie II, Ruhr-Universität Bochum, Universitätsstr. 150, 44780 Bochum
The weakly bound complexes N2O-H2O and N2O-D2O were
observed in a two-dimensional supersonic jet expansion using a
leadsalt-diodelaser-spectrometer. Application of a new
Herriott-type multipass cell improved the sensitivity
significantly.
Calculations carried out in our workgroup and microwave
spectroscopy [1] found a T-shaped arrangement of the heavy atoms
in the complex. The dipole moment and the A-rotational constant
indicate an equilibrium structure in which the N2O-molecule
shows an angle of about 20∘ against the intermolecular
axis. This rather large angle indicates a second hydrogen bond
interaction in the complex. Infrared spectroscopy of the
vibrational-rotational modes of the complexes lead us to the
intermolecular potentials which are of particular interest for
atmospheric chemistry.
On the poster we present spectra in the range of the higher
frequency stretching vibration of N2O at 2224 cm−1 as
well as the results of their analysis.
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[1] D. Zolandz, D. Yaron, K.I. Peterson, and W. Klemperer, J. Chem. Phys.
97, 2861 (1992)