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Bonn 2000 – scientific programme

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MO: Molekülphysik

MO 21: Poster II: Van-der-Waals Systeme

MO 21.3: Poster

Thursday, April 6, 2000, 17:00–19:30, Aula

A combined theoretical and experimental study of the NN and NH stretching vibration of Ar-HN2+ — •Peter Botschwina1, Rainer Oswald1, Harold Linnartz2, and Dorin Verdes21Institut für Physikalische Chemie, Tammannstrasse 6, D-37077 Göttingen — 2Institute for Physical Chemistry, Klingelbergstrasse 80, CH-4056 Basel

A combined theoretical and experimental study of the ν1 and ν2 stretching vibrations of Ar-HN2+ is presented. These correlate asymptotically with the NH and NN stretching vibration of HN2+, respectively, but undergo strong anharmonic interaction with each other in the complex. As a consequence, the ν2 band experiences an unusually large anharmonicity contribution to the red shift and a rather dramatic increase in intensity. The first observation of this band is presented based on tunable diode laser absorption spectroscopy in a supersonic planar plasma, using electron impact ionization. Additional data for the ν1 band are presented as well.

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