Vibrational structure in the photoelectron spectrum of cyclobutadiene as a probe of structure
作者:Daniel W. Kohn、Peter Chen
DOI:10.1021/ja00060a035
日期:1993.4
The photoelectron spectrum of cyclobutadiene, c-C[sub 4]H[sub 4], is reported with partial resolution of vibrational structure. Model calculations of the Franck-Condon envelope in the spectrum, based on ab initio geometries and force constants for c-C[sub 4]H[sub 4][sup [center dot]+], find a surprisingly good agreement for a transition from the rectangular neutral to a rectangular, as opposed to a
环丁二烯的光电子能谱 cC[sub 4]H[sub 4] 报告了振动结构的部分分辨率。基于 cC[sub 4]H[sub 4][sup [中心点]+] 的 ab initio 几何和力常数,谱中 Franck-Condon 包络的模型计算,发现从矩形中性到矩形,而不是菱形或方形,自由基阳离子。还确定了 8.16 [+-] 0.03 eV 的绝热电离电位。该光谱证实,在 C[sub 4]H[sub 4][sup [中心点]+] 的从头计算中需要 [sigma] 和 [pi] 电子之间的相关性,以获得甚至定性正确的 Jahn- Teller 失真的离子。26 个参考文献,5 个图,1 个标签。