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首页> 外文期刊>Journal of Research of the National Institute of Standards and Technology >Vibrational Branching Ratios and Asymmetry Parameters in the Photoionization of CO_2 in the Region Between 650 A and 840 A
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Vibrational Branching Ratios and Asymmetry Parameters in the Photoionization of CO_2 in the Region Between 650 A and 840 A

机译：650 A和840 A之间区域CO_2光电离中的振动分支比和不对称参数

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摘要

The vibrational branching ratios and asymmetry parameters for CO_2 have been determined in the wavelength region of 650 A to near the ionization onset at about 840 A. the study was performed using synchrotron radiation from the Daresbury storage ring that was dispersed with a 5 m grating monochomator that afforded resolution of 0.1 A to 0.2 A. This resolution allowed the study of the branching ratios and asymmetry parameters with enough detail to see the changes in the parameters within the pronounced autoionization structure in CO_2 in this wavelength region. While the electron spectrometer resolution was not sufficient to resolve the spin orbit and Renner-Teller splitting in the photoelectron spectra, we are able to fit the data with a model that identifies the major structure in terms of the symmetric stretch and elements of the asymmetric stretch and bending modes. A calculation of the expected relative vibrational excitations based upon the Franck-Condon principle clearly showed non-Franck-Condon behavior in some of the vibrational-electronic transitions.
机译：已经确定了CO_2的振动分支比和不对称参数，位于650 A的波长区域中，接近于840 A的电离起始点。该研究是使用来自Daresbury存储环的同步加速器辐射进行的，该辐射是用5 m光栅单分频器分散的该分辨率可提供0.1 A至0.2 A的分辨率。该分辨率允许对分支比和不对称参数进行足够详细的研究，以了解该波长区域内CO_2在明显的自电离结构内的参数变化。尽管电子光谱仪的分辨率不足以解决光电子谱中的自旋轨道和Renner-Teller分裂，但我们仍可以使用一个模型来拟合数据，该模型根据对称拉伸和非对称拉伸的元素来标识主要结构和弯曲模式。基于弗兰克-康登原理的预期相对振动激发的计算清楚地表明在某些振动电子跃迁中非弗兰克-康登行为。

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