Abstract

In the past decade high resolution spectroscopy of van der Waals complexes attracted much attention because of their exotic structures and dynamic properties well above the dissociation limit. The structures of polar complexes in the ground vibronic state have been determined by molecular beam electric resonance or pulsed Fourier transform microwave spectroscopy. Dynamic properties of complexes in their electronic excited states have been studied by laser induced fluorescence in the visible region. In the infrared region, however, the measurements are still scarce and almost all of the studies are limited to the complexes of linear molecules in the near IR region (>2000 cm−1). The importance of high resolution spectroscopy in the infrared region is that it provides direct information on the dynamic behavior of a large number of small complexes, in particular on the large-amplitude motions and dissociations in the loosely-bound molecular systems. Furthermore, dimers and larger complexes are usually non-polar or have very small dipole moments for their higher symmetries, and therefore high resolution infrared spectroscopy is the almost only method to study their structures.

© 1988 Optical Society of America

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