Abstract
Fluorene–Arn complexes formed in a pulsed supersonic jet have been studied in their S1 state using two color REMPI spectroscopy with mass resolved detection. The appearance and shifts of the S1 origins relative to the fluorene monomer are measured for cluster sizes up to n = 30. The shifts and appearance of these bands are used to identify multiple conformations at low n and have indicated a shift from two sided clustering by Ar at low n to primarily one sided clustering at large n. The ionic ground state of the smaller clusters (n⩽6) are studied using mass analyzed threshold ionization (MATI) spectroscopy. The change of the ionization potentials as a function of cluster size has been determined. In the case of the fluorene–Ar4 cluster, the MATI spectrum of two separate cluster conformations was measured, revealing significantly different ionization potentials. Vibrational dynamics has been studied in several smaller clusters (n⩽3) by measuring MATI and ZEKE spectra when pumping vibronic transitions in the fluorene chromophore. Significantly enhanced coupling of the chromophore to van der Waals modes is observed in going from n = 1 to n = 3.
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