Fluorescence from photoexcitation of CF3X (X=H, Cl, and Br) at 50ndash;106 nm

摘要

The photoabsorption and fluorescence cross sections of CF3H, CF3Cl, and CF3Br are measured in the 50ndash;106 nm region using synchrotron radiation. Fluorescence spectra from photoexcitation of these molecules are dispersed to identify the emitting species to be mainly the excited CF@B2, CFast;3, and CF3X+ast;, but not CF+@B3. The fluorescence excitation function of CF3X (X=F, H, Cl, or Br) is generally divided into three excitation bands; each band produces a specific excited species. The fluorescence yields of the studied molecules are determined and correlated with dissociation thresholds and ionization potentials. The excited ion states that may emit are discussed.