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首页> 外文期刊>The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory >Observation of the A~2sum~+ <- X~2#PI# Electronic Transition of NaO
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Observation of the A~2sum~+ <- X~2#PI# Electronic Transition of NaO

机译：NaO的A〜2sum〜+ <-X〜2＃PI＃电子跃迁的观察

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The gas-phase infrared spectrum of the A~2sum~+ <- X~2#PI# electronic transition of the NaO radical was observed for the first time utilizing tunable diode laser differential absorption spectroscopy; 109 lines were found within the region 2015-2095 cm~(-1) and 45 lines within 2654-2696 cm~(-1). The NaO radical was produced by reaction of sodium vapor with N_2O in a fast flow tube and detected using an astigmatic Herriott multipass absorption cell combined with rapid sweep integration absorption signal processing. Simple kinetic studies were performed in order to differentiate the NaO radical features from precursor N_2O lines. The NaO A~2sum~+ <- X~2#PI# vibronic band structure was modeled using ab initio calculations by Langhoff and co-workers; the simulated NaO band profile agrees reasonable well with that observed. A preliminary assignment of some observed lines and the resulting molecular constants are presented. Quantitative absorption strength measurements indicate that either absorption line strengths for this transition are significantly smaller than indicated by ab initio calculations by Langhoff and co-workers; the simulated NaO band profile agrees reasonable well with that observed. A preliminary assignment of some observed lines and the resulting molecular constants are presented. Quantitative absorption strength measurements indicate that either absorption line strengths for this transition are significantly smaller than indicated by ab initio calculations or the Na + N_2O reaction produces a significant fraction of NaO(A) state which resists collisional quenching under our experimental conditions.
机译：首次利用可调二极管激光微分吸收光谱法观察了NaO自由基的A〜2sum〜+ <-X〜2＃PI＃电子跃迁的气相红外光谱;在2015-2095 cm〜（-1）范围内发现109条，2654-2696 cm〜（-1）范围内发现45条。 NaO自由基是通过钠蒸气与N_2O在快速流管中的反应产生的，并使用像散性Herriott多程吸收池结合快速扫描积分吸收信号处理进行检测。为了区分NaO自由基特征与前体N_2O谱线，进行了简单的动力学研究。朗霍夫及其同事使用从头算法对NaO A〜2sum〜+ <-X〜2＃PI＃振动带结构进行建模。模拟的NaO谱带谱与观察到的谱图非常吻合。介绍了一些观察到的谱线的初步分配和所得的分子常数。定量吸收强度测量表明，该过渡的吸收线强度均远小于Langhoff及其同事从头算的结果。模拟的NaO谱带谱与观察到的谱图非常吻合介绍了一些观察到的谱线的初步分配和所得的分子常数。定量吸收强度测量结果表明，此过渡的吸收线强度显着小于从头算的指示，或者Na + N_2O反应产生很大一部分的NaO（A）状态，在我们的实验条件下，该状态可抵抗碰撞猝灭。

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