LASER-ENHANCED IONIZATION SPECTROMETRY OF THE OH RADICAL IN A FLAME
The OH radical produced in an air-acetylene flame resonantly was excited by ultraviolet (UV) laser in the 2824-2838 angstrom region. Enhanced ionization signals were detected. The spectral band of the OH radical was obtained in the vicinity of UV 2830 angstrom, corresponding to aX2-pi --> A2-SIGMA(upsilon = 0 --> 1) transition of OH. More than twenty spectral lines were measured, which coincide with previous data obtained from flame emission spectroscopy. This method has provided a way of radical determination and flame diagnostics.