STRUCTURE OF THE CARBAZOLE-AR2 TRIMER FROM HIGH-RESOLUTION UV SPECTROSCOPY

Highly resolved spectra of the 0(0)0 (S1 <-- S0) transition of the car bazole-Ar2 complex were measured by mass-selective resonance-enhanced two-photon ionization with a narrow-band pulsed laser (DELTAnu < 140 M Hz). The parallel c-type rotational band structure displays regular sh arp features which are used to find an accurate set of rotational cons tants of the trimer. From the experimental result a (2/0) structure of the investigated complex with the two Ar atoms located on one side of the carbazole plane can be excluded. Two possible (1/1) structures an d consequences for the solvation mechanism are discussed.