The Sensitization Effect in the Laser-Induced Infrared Fluorescence Spectroscopy by Addition of SF6

A considerable degree of the sensitization is realized in the laser-induced infrared fluorescence spectra when sulfur hexafluoride (SF6) is mixed with objective samples in the gas phase. It is shown that the marked intensity enhancement occurs though the quantity of added SF6 is very small relative to those of samples. The sensitization degree has been examined in terms of the concentration of an objective sample and it is shown that the degree of sensitization is abruptly enhanced with lowering its concentration. A possibility of a new vibrational spectroscopy with high sensitivity by use of this effect of SF6 and its applications to microanalysis are suggested.