FLAME SAMPLING PHOTOIONIZATION MASS-SPECTROMETRY OF DICHLOROETHENOL

A newly developed flame-sampling laser-ionization mass spectrometer ha s been used for the detection of combustion intermediates in a low-pre ssure methane/oxygen flame seeded with trichloroethylene. Among the mo st prominent intermediates are 1,1-dichloroethylene and 2,2-dichloroet henol. Near-threshold photoionization efficiency curves, produced with a tunable vacuum ultraviolet (VUV) laser light source, are used for i somerically selective detection of these species. The previously unmea sured ionization potential for 2,2-dichloroethenol is placed at 9.09 /- 0.02 eV. (C) 1998 Published by Elsevier Science B.V.