Birer Ozgür, Moreschini Paolo, Lehmann Kevin K, Scoles Giacinto
Chemistry Department, Princeton University, Princeton, New Jersey 08544, USA.
J Phys Chem A. 2007 Aug 9;111(31):7624-30. doi: 10.1021/jp070741n. Epub 2007 Jun 20.
We have recorded the S1 <-- S0 electronic spectra of Biphenylene and its Ar and O2 van der Waals complexes inside helium nanodroplets using beam depletion detection. In general, the spectrum is similar to the previously reported high-resolution REMPI spectrum. The zero phonon lines, however, are split similar to the previously reported tetracene case. The calculated potential energy surface predicts that helium atoms can simultaneously occupy all equivalent global minima positions. Therefore, it appears that the splitting cannot be explained either by different isomers or by tunneling. Furthermore, surprisingly the splitting is retained for the Ar van der Waals complexes (and possibly for the O2 complex as well). This case suggests that the current models of the origin of zero phonon line splitting and the helium solvation are incomplete.
我们使用束流耗尽检测记录了氦纳米液滴内联苯及其与氩气和氧气的范德华络合物的S1 <-- S0电子光谱。总体而言，该光谱与先前报道的高分辨率共振增强多光子电离（REMPI）光谱相似。然而，零声子线的分裂与先前报道的并四苯情况类似。计算得到的势能面表明，氦原子可以同时占据所有等效的全局极小值位置。因此，似乎这种分裂既不能用不同的异构体也不能用隧穿来解释。此外，令人惊讶的是，氩气范德华络合物（可能氧气络合物也是如此）的零声子线分裂依然存在。这种情况表明，目前关于零声子线分裂起源和氦溶剂化的模型是不完整的。
