# LIFETIME BROADENING IN THE ROTATIONALLY RESOLVED ELECTRONIC SPECTRA OF SOME FURAN DERIVATIVES AND ANALOGS IN THE GAS PHASE

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 Title: LIFETIME BROADENING IN THE ROTATIONALLY RESOLVED ELECTRONIC SPECTRA OF SOME FURAN DERIVATIVES AND ANALOGS IN THE GAS PHASE Creators: Alvarez-Valtierra, Leonardo; Pratt, D. W.; Yi, John T. Issue Date: 2007 Publisher: Ohio State University Abstract: Fluorescence lifetimes of the electronic origin and some higher vibronic bands of dibenzofuran (DBF) }, (2006), 244302.} and dibenzothiophene (DBT) have been determined from the analyses of their rotationally resolved S$_1\leftarrow\,\,$S$_0$ fluorescence excitation spectra in the gas phase. A decrease by a factor of eight in the fluorescence lifetime has been observed for DBT with respect to DBF, where presumably the heavy atom effect plays a significant role in the intersystem crossing mechanism of these heterocycles. The high resolution spectra of the electronic origin transitions of two non-concatenated furan derivatives, 2,5-diphenylfuran (DPF) and 2,5-diphenyl-1,3,4-oxadioxole (DPO), exhibit similar lifetime broadening, about four times greater than that of DBF. Detailed information about radiationless transitions in the "statistical" limit will be discussed. Description: Author Institution: Department of Chemistry, University of Pittsburgh, Pittsburgh, PA 15260; Department of Chemistry, Winston Salem State University, Winston Salem, NC 27103 URI: http://hdl.handle.net/1811/31363 Other Identifiers: 2007-FD-05