Birer Ozgür, Moreschini Paolo, Lehmann Kevin K
Department of Physical Chemistry II, Ruhr-University Bochum, Bochum, D-44780, Germany.
Phys Chem Chem Phys. 2008 Mar 28;10(12):1648-57. doi: 10.1039/b717307e. Epub 2008 Feb 5.
We have recorded the electronic spectra of benzo[g,h,i]perylene and coronene and their van der Waals complexes with argon and oxygen with a helium-nanodroplet depletion spectrometer. These molecules differ by the addition of one and two fused benzene rings to perylene, which was previously studied in helium. The coronene spectrum is similar to a previously reported jet-cooled laser-induced fluorescence (LIF) spectrum. The van der Waals complexes with argon and oxygen show different complexation sites and maximum number of adsorbants. We report a vibronically resolved benzo[g,h,i]perylene S(1) <-- S(0) spectrum. The spectral lines are split in a similar way to that of several molecules studied before. However, surprisingly, while the van der Waals complexes with argon are free of the splitting, the complexes with oxygen retain the splitting, with increased linewidth and splitting. We could also observe the S(2) <-- S(0) origin transition of benzo[g,h,i]perylene which was previously observed by cavity ring down spectroscopy. While in general the two spectra are quite similar, the relative intensities and spectral shifts of several lines are different.
我们使用氦纳米液滴耗尽光谱仪记录了苯并[g,h,i]苝和 coronene 及其与氩气和氧气形成的范德华复合物的电子光谱。这些分子与苝相比分别多了一个和两个稠合苯环，苝之前已在氦气中进行过研究。coronene 的光谱与先前报道的喷射冷却激光诱导荧光（LIF）光谱相似。与氩气和氧气形成的范德华复合物显示出不同的络合位点和最大吸附剂数量。我们报道了一个振动分辨的苯并[g,h,i]苝 S(1)←S(0) 光谱。谱线的分裂方式与之前研究的几个分子类似。然而，令人惊讶的是，虽然与氩气形成的范德华复合物没有分裂，但与氧气形成的复合物保留了分裂，且线宽和分裂增加。我们还观察到了苯并[g,h,i]苝的 S(2)←S(0) 起始跃迁，这一跃迁之前通过腔衰荡光谱法观察到。虽然总体上这两个光谱非常相似，但几条谱线的相对强度和光谱位移有所不同。
