【摘要】 本文提出一个新的研究方法,测定出单次碰撞条件下Ba（³D）+N₂O→BaO^*+N₂反应的碰撞截面和化学发光截面。Ba（³D）亚稳态原予是通过低压直流放电产生的,并用原子共振吸收法测出它在原子束中的含量。由碰撞截面和化学发光截面计算出这个反应的化学发光光子产率是29.7±3.3%。更多还原

【Abstract】 The chemiluminescence from Ba（³D）+N₂O beam-gas reaction was studied under single-collision condition, and its photon yield was measured to be 29.±33% in 3500-8000  spectral range. The concentration of metastable Ba（³D） atoms produ-ced by a d. c. discharge was about 5.7% of the total Ba atoms in the beam, Which was determined by the resonant absorption of Ba（¹S） atoms for 5535.5  line. According to the results of the chemiluminescent intensity measurements under different N₂O pressures and the measurements of the spectra in conditions with and without d. c., discharge for Ba atoms, it was found that the collisional cross section for Ba（³D）+N₂O reaction is 142±11² and the chemiluminescent cross section is 42.2±1.4². The systematic error of the photon yield deduced from the above results is about 60%.更多还原