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利用OH自由基A-X电子带系的发射光谱来测量氧炔焰的燃烧温度。以双原子自由基能级结构和分子光谱理论为基础,通过确定OH自由基不同振转能级的布居数及Einstein跃迁几率等参数,得到了任意转动温度、振动温度和展宽条件下的谱线强度分布。进行发射光谱实验,测量了氧炔焰中不同火焰高度的OH自由基的发射光谱。通过理论光谱和实验数据的对比分析发现,不同振动带系的谱支强度分别表征了粒子的转动温度和振动温度,并由此最终确定了氧炔焰不同火焰高度的燃烧温度分别为3 125K和3 380K。
The emission temperature of the oxy-acetylene flame was measured using the emission spectrum of the OH radical A-X electron belt system. Based on the diatomic energy level structure and molecular spectroscopy theory, we determined the population of OH radicals with different vibrational levels and the probability of Einstein transition, and obtained the spectra under arbitrary rotating temperature, vibration temperature and broadening conditions Line intensity distribution. Emission spectroscopy experiments were performed to measure the emission spectra of OH radicals with different flame height in oxy-acetylene flame. By comparing the theoretical spectrum with the experimental data, it is found that the spectral support intensities of the different vibrational bands characterize the rotation temperature and the vibrational temperature of the particles, respectively, and finally the combustion temperatures at different flame levels of the oxy-acetylene flame are respectively 3 125K and 3 380K.