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The laser-induced fluorescence excitation spectrum of the A2Σ-X2Π3/2 transition of CuO in the 540-620nm region has been studied, where the CuO molecule was produced by using the technique of dc discharge reaction under a supersonic condition. We have recorded and rotationally analysed the 0-0, 1-0, 2-0 and 3-0 bands. The rotational constants of the upper state A2Σ- were determined and vibrational constants improved. In addition, the lifetime measurement for the A2Σ- state was carried out under the collision-free condition, and the lifetimes obtained are 469±2, 456±2, 488±3 and 490±4ns for v'=0, v'=1, v'=2 and v'=3 levels, respectively. 相似文献
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Laser induced fluorescence excitation spectroscopy has been used to determine the previously ambiguous assignments of A-state stretching frequencies of CF2 radical under supersonic free jet conditions. The measured frequencies are v’1=1012.1±0.5cm-1, v’3=1180.2±0.5cm-1, which is in good agreement with Cameron's[6] calculation result. Furthermore, some transitions attributed to the (1,n-2,0)←(0,0,0), n≦6 progressions are first reported, and new parameters are derived from the spectra obtained. 相似文献
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In this paper, by using resonance enhanced (2+1) multiphoton ionization (REMPI) of AsH3 and detecting the daughter molecular ions AsH+ and As+, a long progression discrete structure was obtained from 267 to 291 nm, which obeys the formula ν0(cm-1)=68875.3+504.1v′2+5.26v′22. Analysis of the spectrum has revealed that it belongs to 4d Rydberg state transition. Our assignment yields the 4d Rydberg state parameters Te′=67881.1 cm-1, ωe′=495.1 cm-1 and δ=0.962. Finally the 4d Rydberg state structure of AsH3 was discussed. 相似文献
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本文用激光光解-荧光猝灭方法测定了CH3Cl对CH(A,B和C)及CH2Cl2、CHCl3和CCl4对CH(C)的猝灭速率常数。结果表明,氯代甲烷分子对CH(C)的猝灭速率常数近似于CH(B)的猝灭速率常数,而比CH(A)的猝灭速率常数大,但都具有与气动速率相当的量线,表明化学反应在其中可能起着重要的作用,且CH(A,B,C)的猝灭速率常数都随氯代甲烷分子中的C-Cl键数的增加而增大。我们用碰撞络 相似文献
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采用VUV同步辐射光源,在超声冷却条件了研究四氯化碳,光电离的动力学过程,实验表明,母体离子极不稳定。本文通过对CCl4光解离电解碎片出现势的测定,结果有关确认的势力学数据,了该体系中有关离子的标准生成焓、离子型分子自由基中的键能、中性分子及自由其中的键能和母体离子的解离能等一系列热化学数据。详细探讨了CCl4及VUV光解离电离的通道及其它可能发生的动力学过程。 相似文献
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We suggest a simple approach to roughly estimate the excitation cross sections of various steps in a multiphoton ionization (or dissociation) process by applying the measured dependence of product signal on laser intensity. The validity of this method is demonstrated theoretically by means of the rate equations based upon a two-step kinetic model and can, in principle, be extended to the multiphoton process with steps more than two. Some results of numerical test and experiment are quoted. 相似文献