Three laser-based techniques have been used for the measurement of rel
ative concentration profiles of the radicals Cl, CH2Cl, and CH3 and se
veral major species in a low pressure, premixed, laminar CH4/CH3Cl/O-2
/Ar flame. The chlorine atom concentration is suppressed throughout th
e primary flame zone associated with the production of H, O, and OH ra
dicals, but increases rapidly, by the reconversion of HCl to Cl, withi
n an extended flame zone.