【摘要】 在束-气装置上的单次碰撞条件下,利用低压直流放电选择性地激发碱土金属到亚稳态,观察了Ca（¹S）、Ca（¹S’³P）、Ba（¹S）、Ba（¹S,³D）+ClO₂。反应的化学发光.通过测量化学发光总包光强的空间分布,得到这些反应的总碰撞截面为:Ca（¹S）+ClO₂,97（A²）;Ca（³P）+ClO₂,138（A²）;Ba（¹S）+ClO₂,136（A）;Ba（³D）+ClO₂,239（A²）,计算机模拟化学发光光谱,发现新生产物MO（M=Ca,Ba）的电子激发态A¹П态的相对振动布居分布是非玻尔兹曼分布的,求出反应Ba（³D）+ClO₂和Ca（³P）+ClO₂产生的MClC^П→X² ∑⁺跃迁的化学发光截面分别为51（A²）和31（A²）,计算光谱中不同成份的光强,得到了反应产生MO、MCl的产物分支比.最后,讨论了这类反应的机理。更多还原

【Abstract】 The chemiluminescent reactions of ClO₂ with Ca, Ba atoms have been studiedunder single collision condition in a beam-gas apparatus. The metastable states ofthe metal atoms are generated by the use of low valtage DC discharge. The Chemilu-minescence spectra have been observed and the spatial distributions of the intensitiesof the chemiluminescent emissions have been also measured by OMA-Ⅱ. The totalreaction cross sections of metal atoms measured are 97A², 138A² for Ca（¹S）,Ca（³P）and 136A², 239A² for Ba（¹S）, Ba（³D） respectively. The intensities of the chemilu-minescence spectra are increased significantly when the metal atoms are excited totheir metastable states. In particular, the increase of BaO（A’） is much more than thatof BaCl （C） in the reaction of Ba（³D） + ClO₂. In addition, non-Boltzmann vibra-tional distributions were found in the electronic excited state A’1Ⅱ of the products MOin both reactions by computer simulation. The chemiluminescent cross sections of thetransition C²Ⅱ→X²Σ⁺ of the products MCl are 51A² for Ba（³D） + ClO₂, 31A² forCa（³P） +ClO₂ respectively. The branching ratios of the products MO and MCl werecalculated based on the chemiluminescent spectra. A discussion about the mechanismsof these reactions is presented.s更多还原