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用ＸｅＣｌ激光泵浦染料激光器，激发汽油机换气中Ｃ_２自由基３пｕ－３пｇｇ带荧光谱，根据谱线强度，测量了换气中的Ｃ_２浓度（～１０１７ｃｍ－３）；同时研究了汽油机不同空燃比对Ｃ_２浓度的影响。
The fluorescence spectra of C 2 free radical 3пu-3пgg in gasoline engine were excited by XeCl laser-pumped dye laser, and the C 2 concentration (~ 1017cm-3) in the gas was measured according to the intensity of the line. At the same time, On C 2 concentration.