LASER INDUCED FLUORESCENCE OF PHTHALOCYANINE IN HYDROGEN DROPLETS
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Date
2007
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Ohio State University
Abstract
Droplets of hydrogen molecules were generated by the same method as that of He droplets}, 2622 (2004)}. Hydrogen droplets thus produced consist of about $10^{5}$ molecules with a temperature of about 4 K}, 6258 (1995)}. We found that hydrogen droplets pick up phthalocyanine molecules in a pickup chamber like He droplets. Laser induced fluorescence spectra of phthalocyanine molecules captured by hydrogen droplets showed spectra similar to those observed for phthalocyanine-(H$_{2}$)$_{N}$ clusters embedded in He droplets with $N>1000$, but the spectrum in hydrogen droplets showed sharper linewidth than that of phthalocyanine-(H$_{2}$)$_{N}$ in He droplets. In addition, a clear dependence in the linewidth on the \textit{ortho}-to-\textit{para} concentration ratio was observed. We will discuss details of the observed spectra.
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Author Institution: Department of Chemistry, The University of British Columbia, 2036 Main Mall, Vancouver, British Columbia V6T 1Z3, Canada.